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VMariaS [17]
3 years ago
12

I neeeeeddd helppppppp

Biology
1 answer:
NISA [10]3 years ago
6 0

Answer:

It's D

Explanation:

A: Is wrong due to the fact that longer time spans give more credibility

B: Multiple group testing is needed

C: C makes it better because multiple groups would create more diversity than just 2 groups, but this is unnecesary

D: We need a control group

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