When molecules are being transported opposite to the molecules concentration gradient.
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Answer:
you want us to answer ALL those questions , cause that's alot lol but its okay if so .....
Alleles can disappear from a population through natural selection. This relates to the most fit phenotype because the breed with the desirable trait, or the most fit, will live and produce off spring. Eventually the less desirable trait and its corresponding allele will disappear after multiple generations pass. If the environment does not change alleles of non desirable traits will disappear. <span />
