How are the inner planets similar? *

A. The inner planets are made of rock and metallic materials. They all have a liquid outer surface.

B. Inner planets are made of gases such as hydrogen and helium.

C. The inner planets are larger than the outer planets.

D. The inner planets are made of rock and metallic materials. They all have a solid outer

D: The inner planets are made of rock and metallic materials. They all have a solid outer.

Explanation: The four inner planets: Mercury, Venus, Earth and Mars share several things in common. Astronomers call them the “terrestrial planets” because they have solid, rocky surfaces roughly similar to desert and mountainous areas on the earth

answer; i believe the answer is (polygenic inheritance;