Answer:
D. Animals that could not leave would also die after some time.
Step-by-step explanation:
A is incorrect because animals aren't like humans, and most likely don't know how to plant and grow new plants. B is incorrect because no animal eats rocks. C is incorrect because even though they have "more space", they don't have any plants to eat so they would die off. This leaves answer D which is correct because they would die off as well. Plants and animals depend on each other.