B. thick atmosphere
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Answer:
Environment can affect the phenotype. for example person A has tall phenotype in his gene but because of he don't eat a good diet like lack of protein or calcium or don't make too much exercise so it affected their phenotype.
Explanation:
Hydrogen is in a state of matter as a gaseous form. (so the answer is gas)
Cell Theory is an appropriate term because it yet to be confirmed as well as a way to confirm it. However, it is believed to be true do the the amount of things that back up this theory. It also supports multiple other theories that stem from Cell Theory.
Answer:
I believe that A is the answer
