Answer:
B. an asteroid belt lies between them.
Explanation:
The asteroid belt is the circumstellar disc in the Solar System located roughly between the orbits of the planets Mars and Jupiter. It is occupied by numerous irregularly shaped bodies called asteroids or minor planets.
I believe it is the crust
It is true that cells spend most of their time dividing. In fact, they spend 78% of their "life" in interphase.
One of the species dieing off.