Which best characterizes the precambrian era?

a.

abundant plants and animals

b.

dinosaurs

c.

small, one-celled organisms and primitive jellyfish

d.

extensive mountain building

It is C

Explanation:

Because everything's starts out small and they are the smallest in the eras because one cell turns to two cells and etc. it was the beginning of all life forms . It couldn't be dinosaurs because they were in the Mesozoic era. At the time of the Precambrian  era i think it was before the Phanerozoic eon

is it multiple choice?