Salmon leaves salt water and return to fresh water to prevent dehydration. This whole process is due to osmoregulation.
Salmons is born in fresh water and then they migrate to salt water and then comeback to fresh water to spawn.
Salmon need to maintain a stable balance between salts and water because of osmoregulation.
Osmoregulation is a type of homeostasis. homeostasis is important because the salmon's survival and ability to reproduce depends on the functioning of its cells.
When they are in fresh water, they adapt themselves to prevent over hydration. When there are in salt water they adapt to the new changes and prevent themselves from dehydration.
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