It is a learned behavior that maintains the population. It is a learned behavior that maintains salt concentrations. It is an inherited behavior that maintains the population. It is an inherited behavior that maintains salt concentrations.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which statement explains why most salmon leave salt water and return to fresh water?
Possibilities:
- It is a learned behavior that maintains the population.
- It is a learned behavior that maintains salt concentrations.
- It is an inherited behavior that maintains the population.
- It is an inherited behavior that maintains salt concentrations.

It is an inherited behavior that maintains the population.