Luca Cavalli-Sforza is a geneticist who hypothesized that the skin-color change came late because previous people had complete vitamin D access to the foods that they are eating. But the moment they started farming, the main vitamin sources are reduced, making a larger gain of having light skin.
Luca Cavalli-Sforza's hypothesis suggests that the change in skin color came later in European populations due to adaptation to reduced ultraviolet radiation exposure.
Explanation:Luca Cavalli-Sforza's hypothesis for why skin color change came late is related to adaptation to changing levels of ultraviolet radiation. As humans migrated from Africa to areas with less exposure to UV radiation, their skin pigmentation became lighter in order to compensate for the reduced absorption of Vitamin D, which is necessary for bone health and immune function. Cavalli-Sforza's hypothesis suggests that this adaptation occurred later in European populations compared to those in other regions.
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If placed in tap water, an animal cell will undergo lysis, whereas a plant cell will not. what accounts for this difference? if placed in tap water, an animal cell will undergo lysis, whereas a plant cell will not. what accounts for this difference? the expulsion of water by the plant cell's central vacuole the relative inelasticity and strength of the plant cell wall the relative impermeability of the plant cell wall to water the fact that plant cells are isotonic to tap water
Answer: The relative in elasticity and strength of the plant cell wall
Explanation:
Animal cell is not made of cellulose but plant cell is. This adds extra protection to the cell.
The cell wall provides protection from the external environment by avoiding the entrance of unnecessary materials through the cell membrane.
The turgor pressure and vacuoles also helps in the movement of water in adequate amount so that the cell does not bursts.
The major cementing factor(s) in maintaining a long-term relationship is (are) _____.
a. proximity and physical attractiveness
b. similarity
c. proximity
d. physical attractiveness
Final answer:
The major factors in maintaining a long-term relationship center around similarity and shared attributes, which lead to a stronger connection and understanding between partners. The correct answer is b. similarity.
Explanation:
The major cementing factors in maintaining a long-term relationship are not simply proximity and physical attractiveness; rather, they include deeper principles such as similarity and shared values or backgrounds.
While the proximity principle states that we are more likely to form relationships with those we frequently come into contact with, it is similarity in attitudes, interests, and lifestyles that plays a pivotal role in not only the formation but also the maintenance of these relationships.
This concept, known as homophily, explains why people tend to create connections with those who are more like themselves. The correct answer is b. similarity.
In arabidopsis, a mutation causing the b-class genes to be non-functional will result in the organ identity of the four whorls (from the outside to the inside) to be:
When normal microbiota become pathogenic and produce disease they are called opportunistic pathogens?
Opportunistic pathogens are normal microbiota that cause disease when a host's defenses are compromised. Risk groups include the very young, the elderly, and immunocompromised individuals. Examples include S. epidermidis causing infections in hospitals and E. coli causing urinary tract infections.
Explanation:When normal microbiota become pathogenic and produce disease, they are referred to as opportunistic pathogens. These are microorganisms that typically exist in concert with their host without causing disease, but can cause illness when the host's defenses are compromised. Conditions that can lead to such infections include weakened immune systems, breach in protective barriers, or an imbalance in the normal microbiota. High-risk groups for opportunistic infections are the very young, the elderly, pregnant women, individuals undergoing chemotherapy, people with immunodeficiencies like AIDS, post-surgical patients, and those with severe wounds.
An illustrative example is Staphylococcus epidermidis, which is a part of the normal skin microbiota and usually harmless, but can cause severe infections in a hospital setting, especially when introduced to the body through invasive medical devices. Another example is E. coli which is harmless in the large intestine but can lead to urinary tract infections if it manages to enter the bladder. These microbes become opportunistic pathogens because the normal defenses that would keep them in check are no longer functioning properly, thereby offering these microbes an "opportunity" to cause disease.
a dorsal fin of a dolphin and a shark is an example of?
The dorsal fin of a dolphin and a shark is an example of convergent evolution.
What is convergent evolution?Convergent evolution is a type of evolution in which two different species evolved in similar ways usually because environmental conditions for both species are also similar.
The dorsal fin of a dolphin and a shark is an example of this as the dorsal fin is likely related to the same environmental conditions such as water pressure and the need to keep stability in aquatic environments.
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The role of the pancreas, liver, and gallbladder is to ______. use enzymes and bile to break down food and extract its nutrients break down starch clear the system of any toxins remove liquid from the stomach
A digestive fluid that is produced by your pancreas contains enzymes that break down proteins, lipids, and carbs. Through tiny tubes known as ducts, the pancreas sends digestive juice to the small intestine.
What are the role of the pancreas, liver, and gallbladder?The liver breaks down and stores various vitamins and minerals, while also creating bile to break down fats and remove toxins from the body during digestion.
Enzymes produced by the pancreas aid in the breakdown of proteins, lipids, and carbohydrates. The bile that the liver produces is kept in the gall bladder. Liver. Bile, a digestive fluid produced by the liver, aids in the breakdown of lipids and several vitamins.
Therefore, The role of the pancreas, liver, and gallbladder is to digest food.Use bile and enzymes to digest food and release its nutrients. Break down starch, rid the body of any toxins, and drain the stomach's liquids.
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Which factors are used to discern between different types of mass movement?
The example of the sugar glider, a marsupial and the flying squirrel, a rodent, illustrates that homology doesn't always indicate ancestry. this is _________. dominant traits are passed down sexual selection. convergent evolution random chance
Also known as the brain's biological clock, the hypothalamus has a mere __________ neurons that regulate our levels of drowsiness.
20,000
The hypothalamus is a small region of the brain which is located at the base of the brain, near the pituitary gland. The hypothalamus contains interconnecting neurons that regulates the functions of the autonomic nervous system such as maintaining daily physiological cycles, controlling appetite and regulating emotional responses.
do earthworms fertilize their own eggs
Which of the following best explains the role of heat and pressure in the rock cycle?
A. the molten rocks solidify by this process
B. the sediments are deposited by the process
C. they change the mineral composition of rocks
D. they transport sediments from one place to another
the correct answer would be (B)
Which plant structures transport materials such as nutrients and water from the roots to the leaves?
A running compression test indicates a possible restriction on the intake side of a cylinder. what should the technician do next?
what is the most common way humans store carbohydrate energy
PLEASE HELP
Federal environmental policies apply _____.
a) to the nation
b) worldwide
c) only to towns
d) only to states
The answer is D. There are nation that are divided into states (also called federal governments) in countries with devolved structures of government. These states are semi-autonomous regions and are allowed to create their own local policies and laws. Example of a country with federal governments is the United States.
Answer: A
TO THE NATION
Explanation:
The part of the brain most closely associated with the regulation of hunger, thirst and body temperature is the :
After a neuron has reached action potential, the _____ period takes place in which no further action potentials can fire. depolarization polarization hydopolarization repolarization retropolarization
None of the offered answers isn’t correct.
After a neuron has reached action potential, the recovery period takes place in which no further action potentials can fire. The surge of depolarization which travels through the axon of the neuron is known as an action potential. The action potential travels to the axon terminal, where it triggers the release of neurotransmitters. Before the next action potential, the resting membrane potential of the axon must be restored and this is known as the recovery period of the neuron (the neuron cannot transmit another action potential).
The heaviest rainfall would most likely occur on which side of this mountain
The heaviest rainfall would most likely occur on the leeward side of this mountain. The side of a mountain shielded from the prevailing wind is called the leeward side.
What is leeward side ?The leeward side of an island faces away from the wind and is protected from the prevailing winds by hills and mountains. An island's windward side confronts the prevailing, or trade, winds.
The windward side of a mountain range has air rising and cooling, which can result in the formation of clouds. The name of this collection of islands, the Leeward Islands, originates from a time when sailing ships were the only means of getting across the Atlantic Ocean.
In the language of sailing, "windward" refers to moving upwind, whereas "leeward" denotes moving in the opposite direction (downwind)
Thus,The heaviest rainfall would most likely occur on the leeward side of this mountain.
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Which product is missing from the stage of glycolysis?
Glucose → Pyruvate + _________
In what ways might anna's infection have played a role in her untimely death?
Why are vestigial structures considered critical evidence of evolution?
In a healthy ecosystem, many different species of animals may share the same habitat because they each have a different niche. an animal's niche is best described as
An animal's niche is best described as its specific role and position within an ecosystem, including its interactions with the biotic and abiotic factors of its environment.
What is animal's niche?An animal's niche refers to its specific role and position within an ecosystem. It encompasses the unique set of resources, interactions, and behaviors that allow the animal to survive and reproduce successfully in its habitat.
A niche includes factors such as the type of food an animal eats, the way it obtains its food (for example, hunting or scavenging), its preferred habitat, its reproductive strategies, and its interactions with other organisms, including competition, predation, and symbiosis. Essentially, an animal's niche represents its ecological "job" or functional role within the ecosystem, and different species can coexist in the same habitat by occupying different niches and utilizing different resources.
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Once you have stopped for a school bus, do not pass until the driver signals you to proceed, the red lights stop flashing,
After stopping for a school bus, only proceed when the driver signals and the red lights stop flashing. Safety first.
The message is clear: Once you have stopped for a school bus, do not pass until the driver signals you to proceed, and the red lights stop flashing. Here's why this is so important:
Child Safety: When school bus lights are flashing, it means children are getting on or off the bus. These young pedestrians may not always pay full attention to traffic, so it's vital to create a safe zone around the bus.
Legal Requirement: In many jurisdictions, it is not just a safety measure but a legal requirement to stop for a school bus with flashing red lights. Violating this rule can result in fines, penalties, and even license suspension.
Visibility: The flashing red lights and stop sign on a school bus provide clear signals to other drivers on the road, indicating that they should stop to ensure the safety of the children.
Preventing Accidents: Failing to stop for a school bus can lead to accidents, which could have severe consequences, especially for vulnerable children. It's everyone's responsibility to prevent these accidents.
Respecting Traffic Rules: Adhering to the rules about school buses shows respect for the traffic laws and a commitment to the safety of all road users, especially the most vulnerable.
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Which was the normal household pattern in early china?
The pathogen that causes the appearance of genital warts in both males and females:
These cells produce pepsin, which breaks down proteins
Why is urine more concentrated in the morning?
Final answer:
Urine is more concentrated in the morning due to dehydration during sleep and increased levels of Antidiuretic Hormone (ADH), which leads to greater water reabsorption and higher solute concentration in the urine.
Explanation:
The reason urine is more concentrated in the morning is due to a period of dehydration that occurs during sleep. During the night, your body continues to excrete metabolic waste and use water for various bodily functions, but you do not take in any fluids. Antidiuretic Hormone (ADH) plays a key role in this process. This hormone is released to regulate urine concentration and prevent diuresis – the excessive loss of water through urination.
While you sleep, ADH levels increase, causing the collecting ducts in the kidneys to become more permeable to water, resulting in the reabsorption of more water back into the bloodstream. This makes the urine that collects in your bladder overnight more concentrated, which explains the darker color and stronger odor in the morning. Additionally, the urine's concentration can be measured through the urine osmolality test, which clearly shows higher levels of solute concentration after a night of dehydration.
Why did reporter bob woodward become interested in what appeared to be a routine burglary?
Final answer:
Reporter Bob Woodward became interested in the Watergate burglary because of information from anonymous sources implicating the White House. His investigation eventually led to Nixon's resignation.
Explanation:
Reporter Bob Woodward became interested in what appeared to be a routine burglary because he received information from several anonymous sources, including one known as 'Deep Throat', that led him to realize the White House was deeply implicated in the break-in. Woodward and his colleague Carl Bernstein continued to dig and publish their findings, keeping the public's attention on the unfolding scandal. The information eventually led to Nixon's resignation and the indictment of many individuals in his administration.
How can cyanobacteria in contrast to saprotrophic bacteria, live in an enviroment that lacks organic material?
What can be interpreted from the graph?
When working with non-linear functions, the average rate of change is not constant.
When working with non-linear functions, the average rate of change is not constant.
Explanation:When working with linear functions, average rate of change is constant.
Answer:
can i see a grapgh plz
Explanation: