why is oxygen important for all body cells?
a)it is involved in sugar production
b)it reduces the amount of urea in blood.
c)it increases the formation of lactic acid.
d)it is involved in energy producing cycles.

Select all the correct answers. evolution is the process by which species developed and diversified over the course of earth's history. all life on earth started from simple, single-celled prokaryotes, but some species are more closely related than others. scientists can find clues to these close evolutionary relationships by looking for common characteristics between organisms. based on their anatomical similarities, which three of these organisms share a close evolutionary relationship? snake horse ladybug human bacteria