They are viruses that infect bacteria and require a bacterial host in order to replicate themselves
The temperature of the blocks is the dependent variable because it depends on the color of each block. (The black would probably be the hottest)
Answer:
auxins are the hormones responsible for phototropism, the growth of a plant toward the light.
Explanatio
The answer is C, Mercury.
Neptune and Uranus have extremely thick atmospheres, and Mars has an atmosphere that is made mostly of carbon dioxide, but Mercury doesn't have atmosphere at all.
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