Salmon live in both fresh water and salt water during their lives. They are born in in fresh water but migrate out to marine waters for most of their life. Eventually, they return to the place they were born in fresh water to spawn. Changing between fresh water and salt water affects the balance of water in their body. Salmon have an internal control system called osmoregulation that restores the balance by negative feedback. This is an example of which characteristic of life

The question is incomplete because the options are not given. Here are the options gotten from another website.

A. adaptation

B. reproduction and development

C. response to the environment D. energy transformation

E. maintaining homeostasis

The correct option is maintain homeostasis which is C.

Explanation:

This is because salmon posseses adaptive physical characteristics that help it to suitably live both in freshwater and salt water. This is because homeostasis is the ability to resist any change in order to maintain body internal environment and this is a negative loop feedback. Organs of salmon work to control homeostasis but endocrine and nervous system engage more in maintain homeostasis.

nucleus

would be most reasonable answer tbh