Question

What makes Earth unique among all the planets in the solar system?
A. Its orbit is not perfectly circular.
Its orbit is not perfectly circular.
B. It has the fewest moons.
It has the fewest moons.
C. It has a greenhouse effect to keep it warm.
It has a greenhouse effect to keep it warm.
D. It has an atmosphere of mainly oxygen and nitrogen.
It has an atmosphere of mainly oxygen and nitrogen.

Answer 1

Answer:

C) It has a greenhouse effect to keep it warm.

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Answer 2

Answer:

by my opinion the answer is option 'd' because the earth is the only planet which atmosphere is composed of mainly nitrogen and oxygen in the universe