An organism survives a difficult winter. The populations in an area remain the same. One species replaces another species in an ecosystem. Each of several species uses the same amount of resources.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which situation is the best example of ecological succession?
Possibilities:
- An organism survives a difficult winter.
- The populations in an area remain the same.
- One species replaces another species in an ecosystem.
- Each of several species uses the same amount of resources.

One species replaces another species in an ecosystem.