Paragraph 3 suggests that which of the following may be a difference between very old star systems and newer star systems A. Older star systems are likely to have fewer planets, moons, asteroids, and comets than newer star systems. B. Newer star systems probably contain more hydrogen and helium than older star systems. C. Newer star systems probably contain more heavy elements than older star systems. D. The process of solar-system formation may have been fundamentally different in older star systems than in newer star systems.