Answer:
i think its a but i am not absoulty sure
Explanation:
I think the most accepted Theory to make up living things is the cell theory.
Heart,vessels,circulating fluids
Answer: Paleozoic
Explanation: The Paleozoic Era, which ran from about 542 million years ago to 251 million years ago, was a time of great change on Earth. The era began with the breakup of one supercontinent and the formation of another plants became widespread. And the first vertebrate animals colonized land.
when an animal eats plants they could be eating the carbon.
