2 answers:
Answer:
It is most likely C
Explanation:
People get sick and maybe the twin/sibling has a medical condition that may interrupt the experiment.
I think the correct answer is B) There are probably very few astronauts with twin siblings.
Could you mark me as brainliest?
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Human blood type is determined by codominant alleles
Answer:
C
Explanation:
As air passes through our own body causing respiration
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