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Protoplanets formed which of the following? select all that apply.

A) comets
B) asteroids
C) inner planets
D) outer planets
E) moons of the gas giants

1 Answer

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Protoplanets are bodies or celestial objects which have the same size as the moon or a bit bigger. These bodies develop to eventually become planets. Therefore, the answer to this item is most likely letter D. outer planets. 
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