Which of the following statements describes the outer planets of the solar system? a. the outer planets have extremely large gravitational forces. b. the outer planets would be good candidates for human colonization. c. the outer planets have no natural satellites. d. the outer planets contain no solid material.

The correct answer is option D which is, the outer planets contain no solid material.

Explanation:The four planets which are Jupiter, Saturn, Uranus, and Neptune are known as outer planets due to large distance from the sun. These planets are large gas giants and have no solid material inside.Other option are wrong, as they have satellites and have low gravitational pull. And no planet other than earth is suitable for human colonization.

Organism, organ system, organs, tissue, cells

Long term continuous groundwater monitoring, especially with warning systems and anthropic activity monitors