Which sentence best describes the earth system?
a) it is a very stable, simple system that does not change much over time.
b) it is an isolated system that does not gain or lose energy to other systems.
c) it is a large, complicated, dynamic system that often does not follow the laws of nature.
d) it is a dynamic system with parts that interact with each other over short and long periods of time.

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the correct answer is:

a population changes in response to a change in the environment.

i think the answer would be a. after sentence 14! i hope i at least a little