It guarantees the survival of a species. It increases the size of a population. It requires the individuals to be identical. It happens over a long period of time.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which statement best describes the theory of natural selection?
Possibilities:
- It guarantees the survival of a species.
- It increases the size of a population.
- It requires the individuals to be identical.
- It happens over a long period of time.

It happens over a long period of time.