Which are characteristics of natural selection? Select three options.
It affects populations.
It affects only individuals.
It occurs when there is genetic variation.
It occurs when organisms are genetically identical.
It selects organisms with certain traits to survive.
It selects organisms at random to survive.

A, C, and E.

These are the three options best suited for answering this question.

Natural selection - The process whereby organisms better adapted to their environment tend to survive and produce more offspring.

c.more precipitation,but only when emission levels.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.