How can we tell that two species shared a common ancestor, and are therefore related?

the match duh

explanation:

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.