Which of the following examples describes migration behaviors?
a salmon travels hundreds of miles from saltwater to freshwater to spawn at its birthplace.
when a bird gets the opportunity, it flies away from the cage to its natural environment.
a fish feeds on its own when a primary food source is unavailable.

A

Explanation:

Migration behavior in ecology can be define as the behavior shown by the living beings by moving to another region from their native land so as to obtain food, water, mates and when the environmental conditions of the native habitat are not suitable for their survival or reproduction.

The members of salmon species migrates to new location that is marine water to freshwater to release the gametes at their birthplace. This migration is done by the organism to reproduce.

the answer is b.) hydrogen bonds between bases.