The emergence of sophisticated, multicellular animals in the Precambrian epoch is the earliest time in earth's history. It was distinguished by many evolutionary traits and peculiarities, hence option A is correct.
What is Precambrian period?Although the Precambrian accounts for almost seven-eighths of Earth's history, relatively little is known about it, and what is known has mostly been discovered after the 1960s.
The Precambrian fossil record is less extensive than that of the Phanerozoic that followed it, and Precambrian fossils (such as stromatolites) have limited biostratigraphic utility.
It is due to the fact that many Precambrian rocks have undergone extensive metamorphism, hiding their origins, while others have been eroded away or are buried deeply beneath Phanerozoic strata.
Therefore, the advent of complex, multicellular organisms that could carry out complicated tasks signaled the end of this era.
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The correct option is A. The appearance of complex, multicellular animals
The end of the Precambrian period was marked by the appearance of complex, multicellular animals.
This period, which lasted from about 4.6 billion years ago to around 541 million years ago, witnessed the development of various life forms, but the emergence of complex, multicellular organisms was a significant milestone.
This event is often associated with the beginning of the Paleozoic Era and the Cambrian Explosion, during which a rapid diversification of multicellular animal life occurred.
Option A, "The appearance of complex, multicellular animals," correctly represents the event that marked the end of the Precambrian period.
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Which set of characteristics best describes igneous rock? A) largest type of rock, made of organic matter, hardest type of rock B) least abundant type of rock, made of other rocks, made mostly of minerals C) found on all continents, contains wavy bands of stripes, contains fossils D) most abundant type in Earth's crust, made of magma/lava, contains no fossils
Answer:
d
Explanation:
Answer:
D
Explanation:
I took a quiz that had that question.
about how much of earth's fresh water is currently inccessible a)20% b)50% c)80%d)90%
Answer:
b. 50%
Explanation:
Where does DNA replication occur during the cell cycle? Why?
Answer:
S phase of Interphase
Explanation:
If a person has Type A blood which blood types can receive this persons blood?
Answer:
You can receive A and O blood types.
Explanation:
After a plant is set on a windowsill for several days, its owner comes back to find its stem bent at a sharp angle toward the glass of the window. Which of the following describes this movement of the plant in response to stimuli?
A. Gravitropism
B. Negative phototropism
C. Positive phototropism
D. Thigmotropism
Answer:
C. Positive phototropism
Explanation:
This is a response of plants towards external stimuli. The plant is bent toward the glass of the window because light is coming from the window. It is considered as positive phototropism because it is moving towards the light. The opposite occurs with negative phototropism. In negative phototropism, the movement of plant would be away from the external stimulus.
When you talk about gravitropism, this is the direction of the growth of plants that is affected by gravity. Thigmotropism is the growth response of the plant towards physical touch.
which of the following characteristics a monsoon area ?
A. It has a season of strong winds and heavy rains.
B. It has a season of icy snow storms.
C. It has consistent cold temperatures year-round.
D. It has high altitudes and little rainfall.
It has a season of strong winds and heavy rains.
A monsoon area is characterized by a season of strong winds and heavy rains due to seasonal wind changes. These areas receive abundant rainfall during the monsoon season. Therefore, the correct answer is A: It has a season of strong winds and heavy rains.
Explanation:The characteristic of a monsoon area is that it has a season of strong winds and heavy rains. This is due to seasonal wind changes that produce considerably wetter periods, typically in isolated locations of tropical areas, such as the West African coast and the Central African interior. In these areas, during the monsoon season, these regions receive abundant rainfall, meaning that among the options given, option A is correct as it describes a monsoon area accurately.
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Which climate has subclimates with humid summers as well as subclimates with long, bitterly cold winters?
Polar
Tropical rainy
Temperate marine
Temperate continental
Temperate continental
Answer: temperate continental
Explanation: took test
protein carrier for copper important iniron homeostasis
Answer: cytochrome oxidase
Explanation:
Copper may help participate in Heme synthesis by action through cytochrome oxidase. Reutilization of iron by the spleen reticuloendothelial cells is subjected to inhibition by the excess copper.
Basically copper helps in intrcytoplasmic transport of iron and helps maintain the iron gradient by heme synthesis . Any alteration In iron concentration I.e
1. Decrease in iron levels indicates very high copper levels
2.Increase in iron levels indicates deficiency of copper.
What is the "official" name for the X and Y chromosomes?
Just the x and Y chromosomes.
Answer:
Just x and y
Explanation:
There are 24 sets of chromosome the first 22 are numbered 1 through 22. the 23rd is called X and the 24 is called Y.
17. Dermis means
thin layer.
elastic skin.
true skin.
final layer.
I think it means true skin
Dermis means true skin.
What are the different layers of skin?The epidermis, dermis, and hypodermis are the three layers that make up the skin, each with its own structure and function. The skin is made up of a complex network that acts as the body's first line of defense against viruses, UV rays, chemicals, and mechanical harm.The dermis is the skin layer behind the epidermis and above the subcutaneous layer. It is the skin's thickest layer, made composed of fibrous and elastic tissue. As a result, it gives the skin strength and elasticity.Learn more about dermis here:
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chemicals used in chemotherapy treatments to fight cancer can also harm cells in hair follicle and bone marrow what characteristic do this cells most likely share with cancerous cells
A:they form tumors
B:they spread through the blood
C:they dive rapidly
D: they contain a mutation
Like cancer cells, they divide rapidly and grow fast.
The answer would be C.
Answer:
C - they divide rapidly
Explanation:
The patient diagnosed with cancer may, at some point, undergo chemotherapy and, although not having the real size of treatment, already reaches the doctor's office aware that the approach is accompanied by some consequences, such as hair loss, infections, fever. and vomit.
These side effects of chemotherapy are the result of medications, which directly interfere with the ability of cells to multiply, normal or tumor, and vary according to the type and dosage of medications. In each person, the reactions may be different, varying in frequency and intensity.
Like cancer cells, hair follicle cells and bone marrow cells can divide rapidly, so these cells are affected by chemotherapy.
which plant has largest pollen
daisys because there bright yellow cor hold the most pollen
How is DNA copied?
A. The antisense strand of DNA is used as a template to create both strands of the new double helix.
B. The sense strand of DNA is used as a template to create both strands of the new double helix.
C. Each single strand of DNA is used as a template to create a complementary strand of DNA.
D. The mRNA made from the DNA is used as a template to create a complementary strand of DNA.
DNA is copied through a process called semi-conservative replication, where each single strand of DNA is used as a template to create a new, complementary strand.
Explanation:The process of copying DNA is a fundamental component of cell division. The correct answer to your question is C. Each single strand of DNA is used as a template to create a complementary strand of DNA. This process is called semi-conservative replication. In this process, the DNA molecule unzips, and each strand is used as a template to synthesize a new, complementary strand. At the end of replication, there are two DNA molecules, each with one old and one new strand, hence the term 'semi-conservative'.
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Final answer:
DNA is copied through semiconservative replication, C. where each old strand serves as a template for a new complementary strand, resulting in two identical DNA copies for the daughter cells.
Explanation:
DNA is copied through a process called semiconservative replication. During this process, each of the two strands that make up the double helix serves as a template for the creation of a new complementary strand. DNA Polymerase reads the template strand and builds a new strand of DNA, maintaining the base pairing rules where adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C).
If the template strand contains the sequence ATGCCA, the new complementary strand will be TACGGT. Therefore, when DNA replication is completed, each new double helix consists of one parental strand and one new daughter strand, ensuring that the new DNA copies have an identical sequence of nucleotide bases and are divided equally into two daughter cells.
Which of the following are products in the process of photosynthesis? A. carbon dioxide and oxygen B. carbon dioxide and water C. glucose and water D. glucose and oxygen
Answer: the answer is glucose and oxygen
Explanation:
It is not carbon dioxide because, because it is a reactant which means it is used in the process of photosynthesis resulting in the formation of glucose ,neither is water a product because it is also used as a reactant to produce glucose
Oxygen is actually a byproduct but yes it is a product produced during the process of photosynthesis
Answer:
D: glucose and oxygen
Explanation:
Imagine that you live in Maine. Currently there is a high pressure area over Maine. If a low pressure are moves in, how will the direction of the wind change ?
Answer:the wind will move towards the low pressure area
Explanation:this happens by a basic principal called diffusion ,liquids and gases (matter in which molecules are greatly spaced ) tend to move towards low pressure area so the wind molecules will flow towards low pressure area.
Which hypothesis states that the moon originally broke away from Earth during its early formation?
A. Fission hypothesis
B. Accretion hypothesis
C. Capture hypothesis
D. Giant impact hypothesis
Please try to be right.
Answer:
Its A Fission hypothesis
Explanation:
The Fission hypothesis states that the moon originally broke away from Earth during its early formation. This answer has been confirmed as correct and helpful. The Giant impact hypothesis state that the moon originally broke away from Earth during its early formation.
Answer:actually A. Fission hypothesis. "This idea states that a rapidly spinning, molten piece of Earth spun off a large piece of mass shortly after it formed, and this piece of mass later cooled and formed the moon
Explanation:
Match the properties with the subatomic particles.
Answer:
Explanation:
There are three known subatomic particles: Electrons, Protons and Neutrons
Electrons
It has a charge of -1It has negligible massit is found outside the nucleusProtons
It has a charge of +1It has a mass of 1It is found in nucleusNeutrons
It has no electrical charge It has a mass of 1It is found in the nucleusWhich statement best describes the process of sexual reproduction?
A.
Pollen is released with the aid of wind and water.
B.
A sperm cell fertilizes a vertebrate's egg cell, creating a zygote.
.
C.
A mushroom ejects spores into the air even in the harshest conditions.
D.
A regular house fly begins as a maggot after budding.
Answer:
the answer is B)
Explanation: I had this question in my health class lol
Answer:
B. A sperm cell fertilizes a vertebrate's egg cell, creating a zygote.
Explanation:
Not A, because it is showing asexual production, in which, when the pollen lands, it will grow without needing of an opposite gender.
Not C, because it is exactly the same as A, in which it promotes asexual production.
Not D, because while sexual reproduction is needed, it does not give the process, rather, the process of life after being borned (you want an answer that gives the process before birth.
~
What is the molecule in this image?
A protein..............
What is a land breeze?
Air that travels in a curved path
Air that blows at night over short distances
Air that flows steadily in different direction
Air that blows from the poles to the equator
The answer will be air that blows at night over short distances. :)
A land breeze is an air that blows at night over short distances. Hence, option B is correct.
What is a land breeze?Flowing from land to water late at night is a characteristic of the local wind system known as the land breeze. Along coasts near big bodies of water, land breezes, and sea breezes alternate. Both are brought on by variations in the heating or cooling of the water surface relative to the nearby land surface.
In general, land breezes and sea breezes cause coastal locations to have higher humidity levels, more precipitation, and more moderate temperatures. The nearest coastline is where land breezes are strongest, but further inland, they become noticeably weaker.
A land breeze is an air that blows at night over short distances. Hence, option B is correct.
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What are the possible evolutionary relationships between modern organisms and fossil organisms?
Answer:
Patterns and anatomical similarities in the fossil record can be used to Students who understand the concepts can: ... Apply the patterns in gross anatomical structures among modern organisms and between modern organisms and fossil organisms to construct explanations of evolutionary relationships.
Explanation:
it just easy to understand instead of explaining it
A dog weighs 70 N on Earth. If the dog was sent to Moon, how would it's weight change
Well first use the equation w=mg so if he is 70N you plug that in for w. The gravity on eartg is 9.8. So 70=m(9.8) m= 7.14
Now on the moon the gravity is 1.6m/s sooooo use the mAss u previously found and plug it in. 7.14(1.6)=w w= 11.42 so the weight changes on the moon and earth but the mAss remains the same.
Final answer:
A dog that weighs 70 N on Earth would weigh approximately 11.60 N on the Moon due to the lower acceleration due to gravity there, which is about one-sixth of Earth's gravity.
Explanation:
If a dog weighs 70 N on Earth, its weight would change significantly if it were taken to the Moon. This change occurs because the acceleration due to gravity on the Moon is only about 1.625 m/s², which is much less than Earth's 9.80 m/s². To calculate the dog's weight on the Moon, you would use the formula:
Weight on Moon = Mass x Acceleration due to gravity on the Moon
The dog's mass (which remains constant regardless of location) can be found by dividing its weight on Earth by Earth's gravity:
Mass = Weight on Earth / Acceleration due to gravity on Earth
Mass = 70 N / 9.80 m/s² ≈ 7.143 kg
Now, multiply this mass by the Moon's gravity:
Weight on Moon = 7.143 kg x 1.625 m/s² ≈ 11.60 N
which of the following statements is true about external and internal fertilization?
A. external fertilization doesn’t require sexual intercoure
B. all animals that lay eggs use extra large fertilization
C. internal fertilization doesn’t require sexual intercourse
D. all animals that lay eggs use internal fertilization
Answer:
A is correct external fertilisation doesn't require sexual intercourse
Fertilization is defined as the fusion of male and female gametes. The fertilization can be internal or external depending on the organisms and environmental conditions.
The correct answer is:
Option A. external fertilization doesn’t require sexual intercourse
The external and internal fertilization can be explained as:
Internal Fertilization:
Internal fertilization is the process in which egg and sperm cells are united to form a zygote.It takes place inside the female body and follows the mode of sexual reproduction. It gives rise to young offspring similar to the parent. Examples are humans, monkeys, dogs, and other mammals.
External Fertilization:
External fertilization refers to the fusion of gametes outside the female's body.Aquatic organisms like frogs and fish undergo external fertilization. The organism lay eggs in the water, where the sperms released fuse with the female gamete to give rises to the organism. The external fertilization is triggered by the temperature and length of the day.
Thus, external fertilization does not require sexual intercourse, as it takes place outside the female body.
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How is energy expended in active transport?
A. Glycolysis
B. Lysic acid
C. ATP
D. Krebs cycle
Answer:
The correct answer is ATP.
Explanation:
When molecules or ions moves into higher concentration from lower concentration through a cell membrane with the help of enzymes and requires energy, this type of transport of molecules or substances called active transport. Active transport requires chemical energy to perform this transport and ATP is the form of chemical energy expended in this process. ATP is an abrevation of adenosine triphosphate.
ATP is the energy expended in active transport.
Active transport is the homeostatic process that requires energy to move particles across the plasma membrane.
Further Explanation Transport in living organismsPlants and animals use various processes to transport materials from one point to another.There are classified as either passive transport or active transport.Active transport It is a type of transport in living organisms that involves movement of substances against a concentration gradient through the plasma membrane.Active transport is the homeostatic process that requires chemical energy to move particles across the plasma membrane.The chemical energy used during active transport is in the form of ATP.Passive transportIt is a type of transport that does not involve the use of energy to aid movement of substances in living organisms.Passive transport involves free movement of substances and through special types of transporters or carriers.Types of passive transport includes; simple diffusion, facilitated diffusion, osmosis, and mass flow among others.Types of passive transportFacilitated diffusionFacilitated diffusion is a type of passive transport which involves the diffusion of solutes by use of transport proteins in the plasma membrane.Facilitated diffusion uses transport proteins to transport solutes down their concentration gradient.Osmosis Osmosis is a special diffusion that involves the movement of water molecules from a region where they are highly concentrated to a region where they are lowly concentrated through a semipermeable membrane.It may also refer to the movement of water molecules from a region of low particle concentration to a region of a high particle concentration.Diffusion Diffusion is a type of passive transport that involves movement of particles from a region of high concentration to a region of low concentration.Diffusion involves movement of molecules of substances other than water.Keywords: Active transport, energy in the form of ATP, Passive transport, Diffusion, Osmosis,
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Subject: Biology
Topic: Transport in living organisms
Sub-topic: Active transport
Which of these mass movement events is considered
A) creep
B) rock avalanche
C) slump
D) rock fall
Rock avalanche is a mass movement event that is considered a slide. The correct answer is B.
Rock avalanche is a large landslide from rock slopes. It travels farther than smaller events. Rock avalanche rarely occur but they are very catastrophic events that can result into huge fatalities.
Further ExplanationRock avalanche is very dangerous being the most deadly of all landslides events. It is a deep seated rock that is made up of rapid break up of failed rock mass with high velocities and long run-outs.
Rock avalanches became known in 19th century in Switzerland. It was first recognized in Switzerland when the Elm and Goldau events killed several people that are even far away from the origin of the slide.
The Elm and Goldau events in Switzerland revealed Rock avalanche possesses some peculiarities. Both events entail volumes of cubic meters that engaged large amount of energy and the distance covered in both events is very long.
After these catastrophic events, all rockslides that relates to these characteristics are classified as large rockslides, rock avalanche or “sturzstorms”.
Rock avalanche always result in high number of fatalities in developing countries. However, landslide is triggered by heavy earthquake, heavy rainfall and many other natural causes.
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Forensic Science
Which is a simple test to determine if a paint is made of latex?
A. electron probe X-ray microanalysis
B. gas chromatography
C. mass spectrometry
D. ethanol test
Answer: The answer would be A;electron probe X-ray microanalysis
I hope that this helps! :D
In forensic science ethanol test is the simple test to determine if a paint is made of latex.
What is forensic science ?Any scientific process which is used as part of a criminal investigation is called as forensic science.
This science can span both the grim, grisly procedures of the autopsy and cutting-edge analysis of a crime scene.
forensic science consist of the less glamorous, painstaking lab work of DNA profiling, fingerprint analysis and the uncovering of hidden digital files.
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(True or false) Whale sharks and manta rays are very large predators and are a danger to divers?
(True or false) octopus always remain the color that they were when born?
(True or false) the sex of baby turtles is determined by the temperature of the sand they incubate in?
(True or false) some corals produce both sperm and eggs?
1. False
Whale sharks and manta rays can indeed be large, and they are predators, but they do not pose threat to divers. Both of these species, even though they do not look alike at all, are part of the shark family. While they are both in the predator category, they actually eat miniature organisms and very tiny fish in general, thus not being anywhere near as aggressive or dangerous for the divers as some of their shark relatives. The manta rays for example do not even have teeth to pose a significant threat, they have a poisonous sting on their tail but that is only used for defense, not attack.
2. False
The octopuses are definitely one of the weirdest and most interesting animals on the planet. They are highly intelligent, have even been noticed using tools, have three hearts, one central and eight other independent brains in their tentacles, and also have a beak. Like all of that is not weird enough, they also have the ability to change their color, and not just the color all over, but also to mimic certain patters. The change of color is used for both camouflage for attack and for defense and avoiding predators.
3. True
The turtles spend the majority of their lives in water, but they still use the land for nesting. They will come to the sandy beaches, dig a large hole, and fill the hole with hundreds of tiny eggs, and than cover them with send. The sex of the turtles that are developing in the eggs depends directly on the temperature of the sand, so it can literary be a situation where all of them will be female because of the temperature, or all of them to be male because of the same reason.
4. True
The corals are a weird bunch. They look like plants, but they are actually animals. They also look like one compact unit, but they are actually millions, or billions miniature animals that are collaborating and build colonies. They also are interesting in their reproduction, as all of the species are able to reproduce asexually, but there are some that are able to reproduce both asexually and sexually, depending on the circumstances.
Choose the four types of food molecules digested by the intestines. vegetables,sugars,starches,meats,fats,or proteins. multiple choice
Sugars, starches, fats, proteins.
Vegetables and meats are not types of food molecules but rather, specific food molecules.
How did the cell theory develop?
Answer:
The cell was first discovered by Robert Hooke in 1665. He examined (under a coarse, compound microscope) very thin slices of cork and saw a multitude of tiny pores that he remarked looked like the walled compartments of a honeycomb. Because of this association, Hooke called them cells, the name they still bear.
Explanation:
If everyone on the planet used the same amount of resources as an average American, what percent of the Earth would need to be used to support everyone?
Final answer:
If everyone on the planet used the same amount of resources as an average American, we would need three planets to support everybody. The U.S. population makes up 5% of the global population but uses one-third of all the resources consumed each year.
Explanation:
If everyone on the planet used the same amount of resources as an average American, we would need three planets to support everybody. The current consumption patterns of humans, particularly in developed countries like the United States, are already dramatically reshaping the world. The U.S. population makes up 5% of the global population but uses one-third of all the resources consumed each year.