What percent of species become extinct when mass extinction occurs?
a)About 30%
b)About 50%
c)About 70%
d)About 80%

I would say the answer is d

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion