All of the owls in a certain area represent a population.
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-LavenderVye
Answer:
Speciation by Geographic Isolation
b. rainy
c. temperate
d. tropical
The biomes closest to the Earth's poles are described as polar, characterized by extreme low temperatures and snowy or icy conditions.
Biomes that exist closest to the Earth's poles are described as polar. These cold and harsh biomes include the tundra and ice caps, where temperatures are extremely low and the environment is traditionally snowy or icy. Vegetation in these regions is limited due to the harsh climate conditions. The polar regions are home to animals whose physical characteristics and behaviors have adapted to survive in these extreme conditions, such as polar bears and penguins.
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The correct answer is B
In he process called the central dogma of molecular biology information about the protein production is translated from the DNA molecule to a functional protein.
In the first step, the mRNA is transcribed from a gene on the DNA. The mRNA conians the information about the sequence of amino-acids that will build the protein.
In the ribosomes, amino acids are bound together bu the halp of ribosomal and transport RNA. After additional changes a protein is formed.
Answer:
Explanation:
Nicotine is a type of stimulant that is chemically alkaloid. It works as the receptor agonist at the nicotinic acetylcholine receptor. It is a type of addictive chemical that increases the blood flow, heart rate and some biochemical reactions of the body. In the brain, it has stimulation as well as blocking effect. Medically, it is used for various purposes such as quitting smoking and some other.
Nicotine stimulates and then blocks cholinergic receptors in the brain, leading to both stimulating and relaxing effects.
Nicotine acts in the brain by first stimulating and then blocking cholinergic receptors. It first acts as a stimulant, increasing the release of acetylcholine, which causes excitatory effects in the brain. Eventually, the cholinergic receptors become desensitized and eventually blocked, leading to a reduction in acetylcholine's activity. This process helps explain why tobacco usage can both stimulate and relax users. When nicotine binds to these receptors, it activates them, leading to the release of dopamine and other neurotransmitters, producing pleasurable effects.
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