Chum salmon (Oncorhynchus ketA) are born in freshwater environments and then migrate to the sea. Near the end of their lives, they return to the freshwater stream where they were born to spawn. In freshwater, water constantly diffuses into the body and ions are lost from the body. In salt water, body water diffuses out of the body and excess ions are gained from the water. A salmon's gills have special cells to pump salt in or out of the body to maintain homeostasis. In response to the salmon's moves between freshwater and salt water, some cells in the gills are produced and others are destroyed. These changes made in the cells of the gills during the lifetime of an individual salmon are an example of which of the following?
A) evolution
B) trade-off
C) acclimatization
D) adaptation

Question

Quizplus · Accepted Answer

The changes in the cells of the salmon's gills due to the switch between freshwater and salt water environments are an example of acclimatization, which is the physiological adjustment an individual makes in response to a change in its environment. Evolution refers to gradual genetic changes in a population over many generations, while adaptation involves a heritable trait that increases an organism's fitness in a particular environment. Trade-offs occur when a trait that is beneficial in one context may have negative consequences in another context, but this scenario does not necessarily apply in this case. Therefore, the best choice is C: acclimatization.

Chum Salmon (Oncorhynchus KetA) Are Born in Freshwater Environments and Then