Each nucleotide is composed of question 4 options: a. two phosphates, one nitrogenous base, and two sugars. b. one phosphate, one nitrogenous base, and one sugar. c. two phosphates, one nitrogenous base, and one sugar. d. one phosphate, one nitrogenous base, and two sugars. e. one phosphate, two nitrogenous bases, and one sugar.

a nitrogenous base, a sugar, and a phosphate.

Explanation:

A nucleotide is the basic subunit of both DNA bad RNA. It contains a base with nitrogen, a 5-carbon sugar and a phosphate group.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: