I think your anwser would be all of the above but you don't have it
Organ system is the answer according to me if it is one word question
Answer:
The answer is c because A and B are not really giving off an imporant feeling to why carbon is important and D if you read the question carefully it says abundant which means to be a lot of, so C would be your answer
and plus i did the test
Explanation:
I don’t know if this is a question but yes a controlled experiment allows you to isolate and test the hypothesis
