9. Why are natural resources not distributed evenly
nor randomly?
a. they are dependent on astrological signs
b. they are derived from natural geological
processes
c. migration patterns are different
d. evolution always selects the best adapted

The given statement, "pericardial fluid is located in a space external (superficial) to the visceral pericardium," is false because pericardial fluid is located in a space internal to the visceral pericardium but external to the parietal pericardium.

The pericardium is a double-layered sac that surrounds and protects the heart. The visceral pericardium, also known as the epicardium, is the inner layer that is in direct contact with the heart muscle. The parietal pericardium is the outer layer that forms the sac around the heart.

The space between the visceral and parietal pericardium is called the pericardial cavity. This cavity contains a small amount of pericardial fluid, which serves as a lubricant. The pericardial fluid helps reduce friction between the layers of the pericardium during the movement of the heart.

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Answer:

Marine mammals are generally large because their size is advantageous in their aquatic environment. The unique challenges of living in the ocean, such as the need to stay warm, move efficiently through water, and find food, have contributed to the evolution of large body sizes in marine mammals.

Firstly, larger animals have a lower surface area to volume ratio, which means they lose heat more slowly than smaller animals. This is important for marine mammals, as water conducts heat away from the body much faster than air does. Therefore, being large helps them maintain their body temperature and stay warm in cold ocean waters.

Secondly, larger marine mammals have more mass to help them swim efficiently through water. This is particularly important for mammals that need to dive to great depths to find food, as larger bodies are more hydrodynamic and require less energy to move through the water.

Finally, larger marine mammals are also better able to store fat reserves, which are essential for surviving periods of fasting when food is scarce. This is particularly important for some species, such as the humpback whale, which migrates long distances and may go months without feeding.

In addition to these ecological factors, the evolution of large body sizes in marine mammals may also be due to their evolutionary history. Many marine mammal groups evolved from land-dwelling ancestors, and the transition to an aquatic lifestyle may have favored the evolution of larger body sizes to cope with the new environment.

Answer:

The age of the mastodon tooth is about 40000 years.

Explanation:

The presence of carbon-14 decreases exponentially in time. Let consider half-life of Carbon 14 in 5000 years. If the mastodon tooth went through 8 half lives, then we estimate its age in 40000 years.

The age of the mastodon tooth is about 40000 years.

Answer:

The dolphin population may diminish a little.

Explanation:

Crabs are one of the many things dolphins eat, and, as the prompt suggests, they cannot live in temperatures greater than 60 degrees F. If climate change makes the temperature 62 degrees F, the crab population will all die. However, note that dolphins do not only eat crabs, as they have other food sources. However, crabs are a major population, so we can see a disruption in the food web, with there being fewer dolphins than usual.

Answer:

sunlight energy is the correct answer to the question

Excessive secretion by the parathyroid glands causes the bones to become brittle.

The parathyroid glands, located near the thyroid gland in the neck, are responsible for producing and secreting parathyroid hormone (PTH). PTH plays a critical role in regulating calcium and phosphate levels in the body.

When there is an overproduction of PTH, a condition called hyperparathyroidism, it can lead to excessive resorption of calcium from the bones, resulting in decreased bone density and increased risk of fractures.

This process weakens the bones and makes them more susceptible to brittleness and breakage.

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Answer:

A

Explanation:

A primary Group is a small social group whose member share close relationship with each other and exchange love, support e.t.c

Answer:

egeunity says A  primary

Explanation:

Answer:

Quite a lot.

Explanation:

I would be wasting your time to put everything here. So keep it simple, prokaryotes and eukaryotes share only ribosomes, cell membranes, cell walls (not all eukaryotes but some, ignore this if you're below 8th grade), and cytoplasms. Everything else would not be found in both prokaryotic and eukaryotic cells.

Answer:

Mitochondria

Explanation:

Answer: There are three major steps to translation: Initiation, Elongation, and Termination. The ribosome is made of two separate subunits: the small subunit and the large subunit. During initiation the small subunit attaches to the 5' end of mRNA. It then moves in the 5' → 3' direction.

Answer:

400X (10 x 40 = 400).

Explanation:

:)

Answer:

Should be 400x

Explanation:

Just take the power of the objective (40x) and multiply by the power of the eyepiece, usually 10X.

Answer:

decrease, decrease

Explanation:

By using antimalarial drugs in order to prevent malaria, the frequency of the sickle cell allele decreases in both areas where malaria is endemic and the areas where no incidence of malaria occurs because there is no necessity of sickle cell allele in the population to prevent malarial disease. Sickle cells have high significance in prevention of malarial diseases so when there is no malaria happens in the population so there is no need for it and the allele slowly removed from the population and decrease occurs in its frequency.

When Robert Hooke looked through his crude microscope at cork, he discovered that the cork was made up of many small units which he called cells.

The cell is the smallest unit of life. It is the lowest level of taxonomy. All cells come from preexisting cells.

Robert Hooke is credited as being the one who discovered cells. He looked through his crude microscope at cork and discovered box-like cavities which he called cells.

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Answer: B) cytotoxic T cell

Explanation:

A variety of interactions between T and B cells and between lymphocytes and accessory cells have been described in both cellular and humoral immunity.

The typical cause of asymmetrical movement of the velum during phonation is velar paralysis or paresis. The correct answer is A.

This occurs when there is damage to the cranial nerve that innervates the velar muscles, specifically the vagus nerve (CN X) or the glossopharyngeal nerve (CN IX).

Velar paralysis or paresis can result from a variety of causes, including stroke, brain injury, tumors, or surgical trauma.

When one side of the velar muscles is weakened or paralyzed, it may cause the velum to move asymmetrically during phonation, resulting in hypernasality or nasal air escape.

Other causes of asymmetrical movement of the velum during phonation include a submucous cleft, adenoid hypertrophy, velopharyngeal hypotonia, or anterior attachment of the levator muscle.

It is important to accurately diagnose the underlying cause of the asymmetrical movement of the velum in order to develop an appropriate treatment plan. Hence, the correct answer is A) velar paralysis or paresis.

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Answer:

because when we griw theplants over there all the nutrition will be already consumed so, we need to replenish it time to time.

1. The environment can be defined as the surroundings or conditions in which an organism or a community of organisms exists.

2. Science plays a crucial role in understanding and solving environmental problems.

It includes both the physical components, such as air, water, land, and climate, as well as the biological components, such as plants, animals, and other living organisms. Humans are indeed part of the environment as we depend on it for resources, interact with it, and have the ability to influence and modify it through our activities. Through scientific research and analysis, we can gather data, study ecosystems, and assess the impact of human activities on the environment. Science provides us with valuable information about the state of the environment, the causes of environmental issues, and potential solutions. It helps us identify patterns, trends, and relationships, allowing us to make informed decisions and implement effective strategies for environmental conservation and sustainability. Additionally, science enables us to develop technologies, practices, and policies that promote environmental protection, resource management, and mitigation of environmental risks.

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Answer:

D) a visual image of a chromosomal defect

Explanation:

The genetic disorders, or inheritance of traits, and abnormality in the chromosome can be studied through pedigree charts and karyotyping.

The correct answer is Option D, a visual image of a chromosomal defect.

The difference between karyotype and pedigree chart can be explained as:

Thus, the correct answer is Option D.

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The probability of: Being Type O = 0.43, Being RH factor - = 0.57, Being RH factor + or Type O = 0.71, Being RH factor - & not Type O = 0.07 A Type O being RH factor - = 0.07A, RH factor + not being Type O= 0.36

The Venn diagram can be used to depict probabilities. In this case, the events are "Females" and "RH factor +".

(a) The probability Venn diagram for the sample data is illustrated in the figure below.

The probability of:

Being Male = (8+5+7+3) / 28= 0.79

Being RH factor - = (8+8+4+2) / 28= 0.57

Being RH factor + or female = (12+5) / 28= 0.61

Being RH factor - and female= 5/28= 0.18

A female person being RH factor - = 5/28= 0.18

A RH factor + being female= 12/28= 0.43

The probability of: Being Type O = (5+2+1+3) / 28= 0.43

Being RH factor - = (8+8+4+2) / 28= 0.57

Being RH factor + or Type O = (12+2+5+1) / 28= 0.71

Being RH factor - and not Type O = 2/28= 0.07

A Type O being RH factor - = 2/28= 0.07

A RH factor + not being Type O= 10/28= 0.36

Probability Venn diagrams to answer different questions. We have used the sample data to calculate the probabilities of different events.

Type O being RH factor - = 2/28= 0.07

A RH factor + not being Type O= 10/28= 0.36

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When acetylcholine stimulates its receptors in the neuromuscular junction then the permeability of the sarcolemma to Na+ increases. Acetylcholine is a key neurotransmitter of the parasympathetic nervous system.

The sarcolemma is the cell membrane of muscle cells.

Acetylcholine is a key neurotransmitter of the parasympathetic nervous system that is involved in diverse functions including the contraction of the smooth muscle cells.

In the neuromuscular junction (motor end-plate), motor neurons release acetylcholine, and therefore more sodium (Na+) ions move in than potassium (K+) out within the muscle cell.

This situation produces an electrochemical gradient across the sarcolemma, generating the local depolarization of the motor end-plate.

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Answer:

Because we cannot see some animals properly like jellyfish as their tissue is too soft, and feathers or for can often not make an imprint on fossils.

Explanation:

Answer:

Fossils: They are remains of animals or plants in the past that were somehow preserved and buried under the earth's crust.

Explanation:

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Answer:

i. with decrease of sunlight means less photosythsis which lead to decrese in plant growing crop and other food .

2 more  number of producers mean excess of food as  they more producers  then consumers

3  increase in the herbivour population  size by either reproduction nor migration from different area then after some time the food supply will decrease in the surrounding area .

d Trophic efficiency The ratio of production at one trophic level to production at the next lower trophic level. is calculated by the percentage of energy that consumers in one trophic level gain and convert into biomass from the total stored energy of the previous trophic level.

Explanation:

The given statement, "Before testing for starch, chlorophyll has to be removed from the leaf as it interferes in the test for starch due to its green color," is true because the color of chlorophyll masks the color change during starch testing.

Chlorophyll is the green colored pigment present in plant cells, and a few bacterial and fungal cells. The chlorophyll provides color to the plants as well as is very essential for the process of photosynthesis.

Starch testing is the test carried out to check for the presence of starch in any compound. The color change in the test indicates the presence of starch. If the color of the compound changes to blue-black, it depicts a positive test.

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Storage of nuclear waste might be considered an ultrahazardous activity in a mountainous area.

Why is nuclear waste a problem, and what is it?

Radioactive waste or nuclear waste can be produced by processes that create or use radioactive material. Due to the radioactive particles it emits, radioactive waste poses a risk to both the environment and human health if it is not adequately managed.

Nuclear reactors, fuel processing plants, hospitals, and research centers all produce radioactive (or nuclear) waste. While deconstructing and dismantling nuclear reactors and other nuclear facilities, radioactive waste is also produced. The issues are both technical and political, and governments and industry agree that deep burial is the best solution—at least for the time being—after decades of using civil nuclear power and billions spent investigating various geological sites and techniques to best dispose of the waste.

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Answer:

in an urban area

Explanation:

i just took the test

Answer: the answer is b!

Answer:

Cell-surface receptors are involved in most of the signaling in multicellular organisms. There are three general categories of cell-surface receptors: ion channel-linked receptors, G-protein-linked receptors, and enzyme-linked receptors.

Cells contain proteins known as receptors, which bind to signaling molecules and cause a physiological response. Different receptors recognize different molecules.

Receptors are proteins, typically cell surface receptors, that bind to ligands and cause immune system responses.

Cells contain proteins known as receptors, which bind to signaling molecules and cause a physiological response. Different receptors recognize different molecules.

Insulin receptors bind insulin, dopamine receptors bind dopamine, nerve growth factor receptors bind nerve growth factor, and so on.

Thus, due to this, receptors are needed for cell signaling.

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Inside each villus of the small intestine are capillaries and a small lymph vessel called a lacteal. These structures are integral to the process of nutrient absorption and play a vital role in the digestion and transportation of dietary substances.

The capillaries found within the villi are part of the network of blood vessels in the body. They are tiny, thin-walled blood vessels that allow for the exchange of nutrients, oxygen, and waste products between the bloodstream and surrounding tissues. In the small intestine, the capillaries absorb the digested nutrients from the intestinal lumen. They absorb amino acids, monosaccharides, and small fatty acids directly into the bloodstream. These nutrients are then transported to various cells and organs throughout the body to support metabolism and provide energy.

The lacteal, on the other hand, is a specialized lymphatic vessel found in the core of each villus. Lymph vessels are a part of the lymphatic system, which is responsible for the transport of lymph fluid, immune cells, and dietary fats. The lacteal specifically plays a key role in the absorption of dietary fats, also known as lipids. When large molecules of fats, such as triglycerides, are broken down by digestive enzymes, they form smaller molecules called fatty acids and glycerol. These products of fat digestion are absorbed by the epithelial cells lining the small intestine and then enter the lacteals.

The lacteals transport these absorbed fats, now in the form of a milky fluid called chyle, through the lymphatic system. Eventually, the chyle enters the bloodstream through the thoracic duct, which connects to the left subclavian vein. From there, the fats are distributed to various tissues in the body for utilization and storage.

In summary, the capillaries and lacteals within the villi of the small intestine are essential components of the nutrient absorption process. While the capillaries primarily absorb nutrients like amino acids, monosaccharides, and small fatty acids into the bloodstream, the lacteals specifically absorb dietary fats and transport them through the lymphatic system. Together, these structures ensure efficient absorption and transportation of nutrients from the small intestine to support overall bodily functions.

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Answer:

The trilobites probably disappeared because either: A) they evolved into something else, or B) they died out due to the amounts of land rising out of the ocean.

People who live close to the equator have evolved to have darker pigmentation as a natural defense against the harmful effects of UV radiation from the sun.

Melanin, the skin's coloring pigment, helps to absorb UV radiation and protects skin cells from damage, such as the development of skin cancer.

On the other side, persons with lighter skin pigmentation are more susceptible to the harmful effects of UV radiation and have a higher risk of developing skin cancer. Their skin's diminished ability to absorb and block UV radiation is what causes this to happen.

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Answer:

1943

Explanation:

add them all togwther