C I know this is hard but it’s easy
Answer:
C Biology
even though the correct answer is ecology, ecology is a branch of Biology
Explanation:
The amount<span> of guanine </span>always equals the amount of cytosine<span>.
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C. alive. The vaccine contains a live strain of varicella-zoster (chicken pox) virus which has been attenuated so that it will stimulates the immune system but does not cause any disease in healthy people.