Biology Forums - Study Force

Observations vs. Explanations. Which of the following statements is an explanation?
A) The farther a galaxy is, the faster it is moving away from us.
B) The inner planets of the solar system are rocky and the outer planets are gas giants.
C) The orderly orbits of planets arose from their formation in a rotating cloud of gas.
D) Hydrogen and helium are important constituents of stars.
E) All planets orbit the Sun in the same direction and nearly the same plane.

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Thanks sir