I think it is C, because if I'm right present principal is something that is happening presently? If so, C would be the answer because they "are doing" the exercises right now in context.
2) Both mars and earth have carbon dioxide ice clouds
Answer:A
Explanation:
I just finished that question
Temperature has a direct effect on whether a substance exists as a solid, liquid or gas. Generally, increasing the temperature turns solids into liquids and liquids into gases; reducing it turns gases into liquids and liquids into solids.
Answer:
C. relating the information to something familiar.
Explanation:
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