The largest of the salivary glands is the
a. submandibular.
b. minor.
c. parotid.
d. sublingual.
Why is it important for your heart to keep oxygen rich blood separate from oxygen poor blood?
Separation of oxygenated and deoxygenated blood in the heart is critical for efficient circulation of oxygen and carbon dioxide. The heart's four chambers, coronary circuit, and rhythmic beating pattern (cardiac cycle) allow for this essential process to occur continually, providing the body with life-supporting substances.
Explanation:Keeping oxygen rich (oxygenated) blood separate from oxygen poor (deoxygenated) blood in the heart is crucial for the efficient movement of oxygen and carbon dioxide around the body, enabling us to maintain our bodily functions and, importantly, enabling us to move quickly when needed. This division and specialization of functions is achieved via our four-chambered heart. The right side of the heart pumps deoxygenated blood towards the lungs in the pulmonary circuit, where it becomes oxygenated again. On the other side, the left side of the heart drives the oxygenated blood to the rest of the body via the systemic circuit.
The heart itself is a highly active organ and has its own unique blood supply, the coronary circulation, ensuring steady supply of oxygen and nutrients and waste removal even when the heart is contracting. Blockage of these coronary arteries can lead to serious health problems, including heart attacks.
In order to ensure this continual circulation, our heart follows a regulated beating pattern known as the cardiac cycle. This cycle encompasses the process of filling the heart with blood and pushing it out, controlled via electrical signals promoting heart muscle contraction and relaxation. This system allows the heart to beat over 100,000 times a day, providing the essential movement of critical life-supporting substances around our body.
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Does mutations occur in both dna and rna
Which of the primary tissue types detects and responds to changes in the environment in order to maintain homeostasis?
A) dense irregular
B) connective
C) epithelial
D) muscular
E) nervous
in the carbon cycle, how is carbon removed from the atomsphere
Answer:
I believe the answer is (D), by plants.
Hope this helps :)
Which phase occurs directly after S phase?
A. Cytokinesis
B. G2
C. G1
D. M phase
Answer:
The correct answer is B. G2
Explanation:
Have a good day
Explain how agriculture affects coral reefs.
Answer:
It is estimated that 25% of coral reefs are threatened by pollutants from agriculture. Unsustainable and intensive agriculture transmits sediment, inorganic and organic nutrients and chemical contaminants to waterways, aquifers and the ocean.
Explanation:
Coral reefs are the exoskeletons that are present in the oceanic ecosystem. The fertilizers and pesticide run-offs from the agricultural field lead to acidification and bleaching.
What are acidification and bleaching?The increased concentration of carbon dioxide in oceanic water causes a decrease in the pH of the water and hence results in acidification and bleaching.
The pesticides and fertilizers used in agricultural fields run off the soil surface by the rain and reach the oceans and destructs the corals due to inorganic and organic chemicals.
These chemicals alter and harm the structural composition of the coral reefs and also the organisms living in them by increasing the acidic concentration.
Therefore, the agricultural run-off containing pesticides and fertilizers affects the reefs.
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describe the causes of coral reef habitation destruction
Final answer:
Coral reef destruction is primarily caused by climate change-induced global warming and human activities, leading to bleaching and habitat degradation. Ocean acidification, pollution, and overfishing exacerbate these issues, significantly harming coral ecosystems and biodiversity, as well as impacting coastal economies.
Explanation:
The causes of coral reef habitat destruction are multifaceted, with both climate change and human activity playing significant roles. The primary cause of coral damage is the increase in water temperatures resulting from global warming. This heightened temperature forces the corals to expel their symbiotic algae, leading to bleaching. Besides, human population growth leads to increased runoff of sediment and agricultural chemicals, which clouds the water and disrupts coral ecosystems. Overfishing compounds the issue by eliminating fish species that help control the predator species consuming corals.
Additionally, the rising levels of CO₂ in the atmosphere, which result in ocean acidification, impede the calcification process that is critical for corals to maintain their hard calcium carbonate skeletons. Without this structure, corals and their dependent species decline in numbers. Not to dismiss other contributing factors such as poor fire management, pollution, mining, and storm damage, which together with overfishing can bring about irreversible changes to coral habitats and the broader ecosystem.
70 pts The human body is composed of several organ systems. One organ, the brain, controls the functioning of all other organs and organ systems. This organ is part of the ___________ system.
A) circulatory
B) muscular
C) nervous
D) respiratory
What is the term used for inserting a healthy copy of a gene into a person who has a defective gene?
A plant grows faster and fuller due to large amounts of fertilizer. If the plant cross-pollinates with another plant later, how will the use of fertilizer on the parent plant affect the plant’s offspring?
Answer:
The height of the offspring will not change
Explanation:
What happens when sunlight Strikes chlorophyll?
Which of the following are always larger than the neutral atoms from which they are formed?
A. positive ions
B. negative ions
C. cations
D. none of the above
Negative ions, or anions, are always larger than the neutral atoms from which they are formed because they gain one or more electrons and their electron cloud expands.
Explanation:The question asks which of the following are always larger than the neutral atoms from which they are formed? The options given are: A. positive ions, B. negative ions, C. cations, and D. none of the above.
When a neutral atom gains one or more electrons, it forms a negative ion or anion, which is always larger than the parent atom. Conversely, when a neutral atom loses one or more electrons, it becomes a positive ion or cation, which is always smaller than the parent atom. Therefore, the correct answer to this question is B. negative ions, as they are the ones that are always larger than the neutral atoms from which they are formed.
What is the primary function of nucleic acids?
The city wants to drain a large lake to use the land for a new courthouse adjacent to county offices. What environmental factors need to be investigated before draining the lake? ...?
There are twenty different types of _____________ which join together in differing sequences and numbers to form different proteins.
Thew correct answer is amino-acids
Amino acids are essential to all life on earth. They are organic molecules comprised out of the amino (NH2) and acidic ( COOH) compound. The twenty amino acids can bound to one another with peptide bonds and form different complex structures called proteins. Proteins are important structural part of cells, enzymes and hormones, and without them the life as we know couldn't exist.
In a genetic cross between two flowering plants that are heterozygous for the color trait, red flowers (R) are dominant to white flowers (r). What fraction of the offspring should have red flowers?
Three–fourths of the offspring should have red flowers.
One–half of the offspring should have red flowers.
One–fourth of the offspring should have red flowers.
Answer:
A. Three–fourths of the offspring should have red flowers
Explanation:
In looking at the layer of rock, bones from the Pliohippus are found in layers above bones of the Mesohippus what does this tell you about the age of these bones
A.)The Mesohippus is older than the Pliohippus
Answer:
The bones of Mesohippus is older than Pliohippus
Explanation:
Pliohippis and Mesohippus are both an extinct genus that occurred in the evolutionary path of the horse. Pliohippus occurred about 15-20 million years back during the middle Miocene period, whereas Mesohippus occurred about 30-40 million years back ranging in age from the Middle of Eocene period to the Early Oligocene period.
This means that the Mesohippus occurred first, and it has undergone evolution, creating the Pliohippus.
Thus, it can be concluded that the bones of Mesohippus after their death are deposited in the rock layers and above this layer, the following rock layer contains the bones of Pliohippus. So the rocks containing Mesohippus are older than the rocks containing Pliohippus.
Hence, the bones of Mesohippus is older than Pliohippus.
Geologists frequently look at the relationships among rock layers. Which statement best describes the information geologists get from studying these relationships?
URGENT!!!!!!!!!!!!!!!!!!!!!!!!!
Adaptation is possible due to the known mechanism of:
genetic recombination
evolution
mitosis
SOS:
The answer is genetic recombination!
Hope this helps!
Answer:genetic recombination
Explanation:
Why do populations of organisms fluctuate?
Which is not true of laterite soils?
a. they form in the wet tropicsb. they are red in colorc. they are very productive agriculturallyd. they are enriched in iron oxide
Answer: c. they are very productive agriculturally
Explanation:
The laterite soil is reddish to yellow in color. It is typically found in hot and wet tropical areas. The soil exhibit a lower concentration of nitrogen, potassium, lime, phosphorus and magnesia. But soil contains high concentration of oxides of iron, manganese and titanium. It is not suitable for agriculture as the soil lacks essential elements required for the growth of crops like nitrogen, potassium and phosphorus. The soil is suitable for making bricks.
On the basis of the above explanation, c. they are very productive agriculturally is not true for laterite soils.
Which organism is the cause of ringworm.
a. virus
b. bacteria
c. protozoan
d. fungus?
Suppose that a patient is diagnosed with a new disease caused by the buildup of waste material in the body’s cells. Which organelle is most likely malfunctioning in the patient’s cells?
Answer:
b
Explanation:
which statement BEST describes an individual enzyme? A. it lowers the activation energy of a reaction and affects many different types of reactions. B. it raises the activation energy of a reaction in the affects many different types of reactions . C. it lowers the activation energy of a reaction in affects only very specific reactions. D. It raises the activation energy of a reaction affects only very specific reactions.
The best description of an individual enzyme is that it lowers the activation energy of a reaction and affects only very specific reactions. Enzymes are highly specific biological catalysts that help accelerate reactions without being consumed in the process.
Explanation:The statement that BEST describes an individual enzyme is: C. it lowers the activation energy of a reaction and affects only very specific reactions. Enzymes are biological catalysts that accelerate biochemical reactions by lowering the activation energy required for the reaction to occur. This means that they reduce the energy needed for reactants, known as substrates, to react with each other. Enzymes are highly specific; they only bind to particular substrates at their active site and facilitate very specific chemical reactions without being consumed in the process.
One of the key functions of an enzyme is to form an enzyme-substrate complex that can lower the activation energy by contorting the substrate molecules in a way that facilitates bond-breaking, helping reach the transition state. This process may involve the enzyme temporarily forming covalent bonds with the substrate. It is important to note that the enzyme will return to its original state after the reaction, ready to catalyze another reaction.
Glyolysis – takes one _______ molecule and converts it two two _________________ molecules.
Aerobic respiration uses _______gas and happens in what two processes (after glycolysis)
Cytochrome c is a protein found in the electron transport chain of all eukaryotes. The table below shows the relative differences in cytochrome c among several species.
What conclusion can you draw from this data?
A. Sheep and rattlesnake both evolved from carp.
B. Humans and chimpanzees are the same species.
C. Humans are more closely related to chimpanzees than carp.
D. Chimpanzees evolved from sheep.
Answer:
The correct answer would be C. Humans are more closely related to chimpanzees than carp.
According to information provided, the cytochrome c of humans is identical to that of chimpanzee. Thus, we can conclude that chimpanzees are close relative of humans.
In contrast, the difference between the cytochrome c of humans and carp is 17%. Thus, the humans and carp are not as closely related as humans and chimpanzees are.
The phylogenetic relation of humans and garden snail would be the least as compared to the relation between humans and any other organism given in the chart.
Based on the data presented in the table, we can draw the conclusion that humans are more closely related to chimpanzees than to carp. Therefore, option (C) is correct.
Why chimpanzees related to humans?Chimpanzees are considered to be the closest living relatives of humans, with whom they share a common ancestor that lived between 6 and 8 million years ago. Both species belong to the same family, Hominidae, and share many physical and behavioral characteristics.
The genetic makeup of chimpanzees and humans is also remarkably similar, with over 98% of their DNA sequences being identical. This similarity suggests that chimpanzees and humans have evolved from a common ancestor relatively recently, and that we share a long history of shared genetic and evolutionary processes. Understanding the similarities and differences between chimpanzees and humans is important for studying human evolution, biology, and behavior.
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The _____ method can help resolve problems logically.
Answer: Scientific method
The scientific method is a process in which the scientist performs an experiment and it is used to explore the natural phenomena in the world and answer question in a logical manner.
It involves the formulation of a hypothesis, then that hypothesis is used to predict the phenomena. After that based on that prediction, a scientist performs an experiment to support the hypothesis.
What problems might arise in a cell that did not complete its G1 phase prior to cell division?
If a cell doesn't complete its G1 phase before cell division, it may lead to genetic abnormalities, cell death, increased risk of cancer, or impaired cell function.
Explanation:If a cell does not complete its G1 phase prior to cell division, several problems may arise. G1 phase is an important part of the cell cycle where the cell grows in size and checks for any DNA damage before proceeding to replicate its DNA. Without completing G1 phase, the cell may not have enough time to properly grow and check for errors in its DNA, leading to potential genetic abnormalities in the resulting daughter cells. This can result in various issues such as cell death, increased risk of cancer, or impaired cell function.
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Describe the flow of energy from the sun to the "reaction center":
Final answer:
The flow of energy from the sun to the reaction center in photosynthesis involves multiple steps, including pigment absorption, energy transfer, and electron transport.
Explanation:
The flow of energy from the sun to the reaction center in photosynthesis involves multiple steps.
The pigments in the light-dependent reactions, such as photosystem II, absorb energy from sunlight.The absorbed energy is transferred from chlorophyll to chlorophyll until it reaches the reaction center.The energy at the reaction center is used to initiate electron transport and the production of ATP and NADPH.This flow of energy enables the conversion of sunlight into chemical energy that can be used by the plant for various processes.