if you have ever used a compass, you know that it can be used to help navigate. It does this with a needle that always points north, so you know which direction you are heading. The needle points to the north because earth is like a giant magnet, with both north and south poles. According to current theory, the creation of earth's magnetic field is closely linked to
Which statement about male and female cones is true? asap!!!
a-Male cones are smaller than female cones.
b-Female cones are smaller than male cones.
c-Female cones release more pollen than male cones.
d-Male cones have more scales than female cones.
Answer: a-Male cones are smaller than female cones.
The cones are the characteristics of the gymnosperms plant species specifically to the Conifers. These plants exhibit naked ovules and the pollination in these cones is aided by the wind pollination. The male cones are smaller than the female cones and grows on the lower branches of the trees whereas the female cones grows on the higher branches. Each bract or scale of the male cone exhibit numerous pollen grains which are blown away by the wind and they pollinate the ovules of the female cones. Each bract or scale of female cone exhibit an ovule at the lower end. Each ovule is fertilized by the pollen to form the seed.
Answer:
a. Male cones are smaller than female cones.
Explanation:
What is one way a person can help reduce the level of carbon dioxide in the atmosphere?
Final answer:
To reduce atmospheric carbon dioxide, one can contribute to reforestation efforts and avoid deforestation, as trees absorb CO₂ during photosynthesis. Alternative energy sources and reducing certain agricultural practices are also key measures.
Explanation:
One way to help reduce the level of carbon dioxide in the atmosphere is through reforestation—planting new trees and avoiding deforestation. Trees and plants absorb carbon dioxide and store it as part of their biomass through a process called photosynthesis. Since carbon dioxide is a major greenhouse gas that contributes to climate change, by increasing the number of trees, we can enhance the natural capacity of the environment to act as a carbon sink, thereby mitigating the effects of excess CO₂ in the atmosphere. Aside from reforestation, other measures include using alternative fuel sources that do not produce carbon dioxide, like solar and wind energy, and reducing activities such as livestock agriculture which contribute significantly to greenhouse gas emissions.
According to life without gravity why can astronauts muscles become weak
Throughout most of the 1800s, the most widely accepted atomic theories were based on research performed by an English chemist named John Dalton. The main tenets of Dalton's theory were: Elements are made of tiny particles called atoms. Atoms cannot be divided into smaller particles. All atoms of a given element are identical. The atoms in one element are different from the atoms in another element. A chemical reaction is a rearrangement of atoms. Then, in 1897, while studying electric discharges in a cathode-ray tube, a British physicist named J.J. Thomson discovered electrons. Which tenet of Dalton's atomic theory did Thomson disprove? A. Elements are made of tiny particles called atoms. B. Atoms cannot be divided into smaller particles. C. The atoms in one element are different from the atoms in another element. D. All atoms of a given element are identical.
Answer:
B
Explanation:
I am taking Chemistry :)
A woman with long hair is a suspect in a burglary case. at the crime scene, several long hairs were found attached to a broken lock of the safe. the police obtain a warrant and request a sample of 25 to 50 hairs from this woman. they tell the woman it is important that they pull the hairs from her head rather than to merely cut the hairs. the police suspect that the woman was stealing to help support a drug habit.
a. why is it important that the police pull the hairs from her head rather than cut her hair?
b. why is it necessary to obtain 25 to 50 hairs from this woman?
c. the woman denies that she is currently taking drugs and states that she stopped using drugs a year ago. explain how the police can determine if the woman has been off drugs for over one year.
d. suppose the hairs of the woman match the hairs found at the crime scene. why does this not necessarily prove that she was the guilty party?
Today, biological anthropologists prefer to use the term ________ rather than race
Which substage of sensorimotor development is characterized by coordination of vision and touch, i.e., hand-eye coordination?
Organisms need a way of storing energy because _____.
a.
a cell can't always immediately use all the energy it gets
b.
an organism often has times when no energy is used
c.
a cell can release only stored energy
d.
a cell cannot create energy and must get it from elsewhere in the organism
Organisms need a way of storing energy because cell can't always immediately use all the energy it gets.
What are cells?Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions.
Moreover, cells are of two types: eukaryotic, which contain a nucleus, and prokaryotic cells, which do not have a nucleus, but a nucleoid region is still present. Prokaryotes are single-celled organisms, while eukaryotes may be either single-celled or multicellular.
Therefore, cells provide structure and function for all living things, from microorganisms to humans. Scientists consider them the smallest form of life. Cells house the biological machinery that makes the proteins.
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Which of the following statements about ATP (adenosine triphosphate) is correct? Hints Which of the following statements about ATP (adenosine triphosphate) is correct? The hydrolysis of ATP is an endergonic process. The cycling between ATP and ADP + Pi provides an energy coupling between catabolic and anabolic pathways. The hydrolysis of ATP can supply energy needed for catabolic pathways. Almost all of the free energy released on the hydrolysis of ATP is released as heat. The energy release on hydrolysis of ATP is the result of breaking a high-energy bond.
ATP is an unstable but essential molecule that provides energy for cells. It does this through a process called hydrolysis, which generates energy through the breakage of high-energy bonds with its phosphate groups. This energy is used to power various cellular activities, often through the process of phosphorylation.
Explanation:ATP (adenosine triphosphate) is a highly unstable molecule which functions as the primary energy-supplying molecule for living cells. ATP is composed of a nucleotide, a five-carbon sugar, and three phosphate groups. The bonds connecting these phosphates, known as phosphoanhydride bonds, are high-energy bonds. When ATP undergoes hydrolysis, it dissociates into ADP (adenosine diphosphate) and an inorganic phosphate ion (P¡), releasing energy which is largely used to perform cellular work. Cells use ATP by coupling the exergonic reaction of ATP hydrolysis with endergonic reactions. During this process, ATP donates its phosphate group to another molecule through a process known as phosphorylation. The phosphorylated molecule, due to this added phosphate group, is left in a higher energy, less stable state, enabling it to undergo its own endergonic reaction.
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How long does it take the moon to cycle through all of its phases ?
Answer:
If you mean "About how long does it take for the moon to cycle through all its different observable shapes?"
Then the answer is a month.
Explanation:
No explanation but I got it right on my quiz haha.
Please help me! I have a mid term tomorrow, and this question is on the review.
Describe how high-energy electrons are ultimately responsible for driving the photosynthetic reactions
High-energy electrons are ultimately responsible for driving the
photosynthetic reactions due to the following:
They help transform ADP and NADP into ATP and NADPH respectively These are then sent to power light-independent reactions that create sugar.Light energy from the Sun excites the electrons in the plants which provides
them with energy for movement through membranes.
The high energy electrons help transform ADP and NADP into ATP and
NADPH respectively which are then used in the light-independent stage to
create sugar which is the final product of photosynthesis.
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Which has a greater impact on the survival of an organism, temperatures above its maximum temperature or temperatures below its minimum temperature?
Extreme temperatures, both above and below an organism's tolerance range, can impact survival, with high temperatures causing rapid fatal outcomes due to enzyme degradation, and extremely low temperatures slowly leading to metabolic shutdown. Extremophiles are notable exceptions that can thrive in such extreme conditions.
Both temperatures above the maximum threshold and temperatures below the minimum threshold can have a profound impact on the survival of organisms. However, each situation affects the physiology of organisms in different ways. Temperatures exceeding the upper limit can lead to enzyme degradation, while temperatures below the lower limit can reduce metabolic rates to a point where the organism cannot sustain necessary life functions. With a drop in temperature, metabolic rates can decrease, thus lowering energy and oxygen needs, which might allow poikilotherms organisms that can endure a wide range of body temperatures to survive on less.
However, extreme cold can eventually lead to a complete metabolic shutdown. Conversely, temperatures that exceed an organism's tolerance can disrupt cellular structures and lead to fatal outcomes more swiftly due to protein denaturation and increased metabolic demands beyond sustainable limits. Some organisms, known as extremophiles, have adapted to survive in these harsh temperatures, but they are exceptions rather than the rule.
When glass shatters does the density change?
A postpartum patient with hearing impairment asks the nurse, how will i know when the baby cries? what does the nurse instruct the parent to do?
If you had made a wet mount of the scrapings from your teeth would you have seen the same organisms as you did with the simple stain?
Final answer:
While a wet mount can allow the observation of living organisms, using a simple stain provides increased contrast to better visualize cell details. Differences in cell morphology and arrangement are more discernible with staining, enabling accurate identification of bacterial species.
Explanation:
If you had made a wet mount from the scrapings from your teeth, it is possible that you might have observed some of the same organisms as you would with a simple stain, but the visualization and the types of organisms identified could be different. Making a wet mount involves placing the specimen in a drop of water on a slide with a cover slip over it, thereby allowing you to observe living organisms and their motility. However, without staining, it can be difficult to see the details of cellular structures and morphology, which means that differences in cell morphology and arrangement may be less apparent.
On the other hand, when performing a simple stain, such as using safranin, specific structures within the various bacteria from your teeth would be more easily visible under the microscope. This staining method increases the contrast and makes it easier to assess morphology, and characteristics such as shape and arrangement. The staining also enables easier differentiation between different types of bacteria when examining colonial morphology, as unstained cells may be transparent and more challenging to differentiate.
Therefore, depending on the method used—simple stain versus wet mount—there might be differences in the observable organisms and in the level of detail you can discern. Simple staining not only allows for better visualization but also for more accurate evaluation of the morphology and identification of different bacterial species present in the sample.
Which hormone increases in production during puberty and is generally believed to be responsible for physical growth and the development of pubic hair in both males and females?
What happens to the speed of a chemical reaction when a catalyst is present
A catalyst is a compound which when added to a chemical reaction increases the rate of a chemical reaction by decreasing the activation energy required by the reactants.
What is a Catalyst?
A catalyst is a compound or element that is added to a chemical reaction increases the rate of a chemical reaction. This is possible because the catalysts decreases the amount of activation energy required by the reactants to undergo collision which will form the product.
A catalyst is found to be most effective in finely divided form as it has more surface area and at optimum conditions of pH, temperature and pressure. Example: Nickel is used as a catalyst in hydrogenation of palm oil into margarine to increase the rate of the reaction.
Catalyst increases the rate of a chemical reaction but they do not give any information about the spontaneity of a chemical reaction.
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What percentage of the human genome is truly unique to the individual and usable for DNA profiling?
99.9%
50%
1%
0.1%
Answer:
0.1%
Explanation:
Humans share 99.9. % of genome with each other but we are still unique when it comes to the remaining 0.1% of genome. Since human genome is made of 3 billion base pairs, 0.1% means that we have 3 million unique base pairs. This portion is used for techniques like DNA profiling. It is used for paternity test and also used to determine the culprit at a crime scene.
Short tandem repeats or STRs are combination of base pairs which are repeated a number of times and they are unique to every individual. STRs fall under 0.1% of unique genome. If STRs in two samples match at the same loci, they belong to the same individual.
A product's transformation process includes all the steps in making a product from production to use and disposal of a product. During the production of energy phase of a nuclear reactor, which of these creates the greatest strain on earth's resources?
A product transformation _____.
multiplies coordinates to transform the imagecombines the coordinates of multiple transformationsfinds the result of combining multiple transformationsMartin finds women with long, dark hair very sexually alluring, and all of his sexual partners have long, dark hair. charles also finds women with long, dark hair alluring. in order for charles to become aroused and reach orgasm, long, dark hair must be present, whether it is on a woman or not. martin's behavior might be classified as __________, whereas charles' behavior might be classified as __________.
The main immediate source of atp (lasting about 10 seconds) as muscle contractions begin comes from
The main immediate source of atp (lasting about 10 seconds) as muscle contractions begin comes from creatine phosphate. It is also known as a phosphorylated creatine molecule that presents as a quick mobilizable that keeps the high-energy phosphates in skeletal muscle and the brain to recycle the adenosine tri phosphate; which is considered as the energy currency of the cell.
__________ proposes that humans are unaware of much of the stimuli in our environment, such as light waves and odors.
Final answer:
The key topic discussed is the low awareness of humans to environmental stimuli due to sensory adaptation and selective attention, highlighted by the cocktail party effect.
Explanation:
The concept being described is that humans are not always aware of the various stimuli in our environment, such as light waves and odors. This phenomenon can be understood through terms like sensory adaptation, where we do not perceive stimuli that remain relatively constant over prolonged periods of time. Our brains are constantly receiving and evaluating sensory information but due to the vast quantity of information, only a portion is consciously processed.
An example of this is the "cocktail party effect," where you may not consciously notice all conversations in a noisy room, but you will likely recognize when your name is spoken. This showcases our brain's selective attention and the background processing taking place, demonstrating that we are constantly in a state of low awareness, not fully perceiving the breadth of sensory information surrounding us.
Oxygen starvation in a cell will most likely lead to
In contrast to positive and negative selection, _____ selection acts to maintain two or more alleles in a population.
Compare and contrast internal rotators and external rotators of the shoulder joint
Internal rotation, or medial rotation, occurs when you rotate your upper arms or your thighs toward the midline of your body. For example, if you stand in anatomical position and turn your arms and hands inward, so that your palms face your thighs, you would be internally rotating your shoulder. Several muscles in your shoulder -- namely the pectoralis major, latissimus dorsi and the deltoids -- accomplish this motion. Similarly, if you stand in anatomical position and turn your legs and feet so that your toes point inward, toward the space between your legs, you would be internally rotating your hips. Several muscles in your hips -- the gluteus minimus, gluteus maximus and piriformis -- accomplish this action.
External RotationWhen you externally rotate, or laterally rotate, your shoulder, you turn your arm and hand away from the center of your body so that your palm faces away from your thigh, when you’re standing in anatomical position. For the hip, external rotation involves turning your thigh so that your toes point out to the side. Deep within your hip, underneath your glutes, lie the muscles responsible for external rotation. Your shoulder external rotators include the poster fibers of the deltoids, the teres minor and the infraspinatus
The inner and outer rotators of the shoulder joint work with average and horizontal turn, separately. The inner rotator is fundamentally the subscapularis, while the outside rotators incorporate the infraspinatus and teres minor.
The shoulder joint, otherwise called the glenohumeral joint, is a multiaxial ball-and-attachment joint that empowers different developments including inner (average) and outer (sidelong) pivot. Inside revolution includes moving the front surface of the arm toward the midline of the body, essentially worked with by muscles like the subscapularis.
Alternately, outer revolution moves the foremost surface of the arm away from the midline, with muscles like the infraspinatus and teres minor assuming key parts.
The essential help for the shoulder joint comes from the rotator sleeve, a gathering of four muscles:
supraspinatus, infraspinatus, teres minor, subscapularis.These muscles act to turn the arm as well as settle the top of the humerus inside the glenoid pit, working as unique tendons to offer primary help. Inward Rotators: SubscapularisExternal Rotators: Infraspinatus, Teres Minor
Alternate versions of a gene are called _______________. they can code for different ________________ of the same character. select one:
a. bases; alleles
b. alleles; bases
c. bases; chromosomes
d. chromosomes; traits
e. alleles; traits
Alternate versions of a gene are called alleles and they can code for different traits. These varied forms of gene loci contribute to genetic diversity within a population, leading to a variety of traits.
Explanation:Alternate versions of a gene are called alleles. They can code for different traits of the same character. Therefore, the correct answer to your question is e. alleles; traits. To elaborate, the word 'allele' is derived from the term 'allelomorph', which means 'other form'. These allelic forms represent variation in the sequence of DNA at a particular gene locus and they contribute to the genetic diversity within a population. The different alleles can result in variations of a trait, like eye or hair color.
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The entrance of a microbe into an individual's vascular space has initiated opsonization. how will the health care provider explain this process critical in stopping the infiltration of the microbe through opsonization
"what marine ecosystem is most similar to a tropical rainforest in terms of diversity?"
Final answer:
The tropical coral reef ecosystem is most similar to a tropical rainforest in terms of diversity, with both environments providing complex habitats for a multitude of species and contributing greatly to Earth's productivity.
Explanation:
The marine ecosystem most similar to a tropical rainforest in terms of diversity is the tropical coral reef ecosystem. Like tropical rainforests, tropical coral reefs are incredibly diverse and complex ecosystems that provide home to a vast number of species, including corals, fish, molluscs, and marine mammals.
Coral reefs are comparable to tropical forests because they both have exceptionally high levels of biodiversity and structural complexity. Not only do these ecosystems harbor thousands of different species, but they also support intricate ecological interactions such as symbiotic relationships, predation, and competition for resources.
Moreover, tropical coral reefs contribute significantly to global productivity just as tropical rainforests do, with their resident phytoplankton performing a significant portion of the Earth's photosynthesis. These ecosystems are critical for the health of the ocean and provide numerous benefits, including fisheries, shoreline protection, and supporting marine life.
Describe how actin and myosin filaments within muscle fibers produce the motile force for muscle contraction