What statement is true about natural selection and evolution A. Evolution is the mechanism by which natural selection occurs

B. Natural selection and evolution both show change over time

C. Evolution and natural selection occurs separately in an ecosystem.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

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.