C. They are specialized tissues that form an organ system.
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B. It is False
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Answer:
: a compound (such as guanosine or adenosine) that consists of a purine or pyrimidine base combined with deoxyribose or ribose and is found especially in DNA or RNA
Answer:
true
Explanation:
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Natural selection gets rid of those who are unfit of surviving and allows those who can survive to reproduce and live on
