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 gave my students this multiple choice question: Which statement explains why most salmon leave salt water and return to fresh water?

Only one answer is correct among these 4 choices:
- 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.

Could you tell me which one is correct?

It is an inherited behavior that maintains the population.