Salmon live in both fresh water and salt water during their lives. they are born in fresh water nut 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 and internal control system called osmoregulation that restores the balance by negative feedback this is a example of which characteristic of life. 1. adaption 2.reproduction and development 3. response to the environment 4. energy transformation 5. maintaining homeostasis