Which of the following is an example of a long-term change to ecosystems?
a.
seasons
b.
tide cycle
c.
evolution
d.
population growth

The correct answer is option C. evolution.

Explanation:

Evolution is the alteration in the traits of a species or population over several generations and depends on the process of natural selection. It is the long term process that takes thousands of years or several generations. This process is accumulated common or rare genes or characters that affect individual species or populations.

Types of evolution are - convergent evolution, co-evolution, and adaptive radiation.

Thus, the correct answer would be option C. evolution.