<span>Aphotic zone (bathypelagic zone)</span><span> The region of a lake or sea where no light penetrates; it is situated beneath the </span>euphotic zone<span>. The aphotic zone contains no algae or phytoplankton, and its inhabitants are exclusively carnivorous animals or organisms that feed on sediment or detritus, all reliant on energy inputs from the euphotic zone. It extends downwards from a depth of about 1000 m, or less in turbid waters, and includes the </span>abyssal zone<span>.</span>
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The blood brain barrier blocks chemicals from entering brain tissue.
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The flow of individuals in and out of a population introduces new alleles and increases genetic variation within that population. Mutations are changes to an organism's DNA that create diversity within a population by introducing new alleles.
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C. and the explanation is i just know
