Assume that some members of an aquatic species of motile, photosynthetic protists evolve to become parasitic to fish. They gain the ability to live in the fish gut, absorbing nutrients as the fish digests food. Over time, which of the following phenotypic changes would you expect to observe in this population of protists?

A) no changes would be expected
B) loss of motility
C) gain of a rigid cell wall
D) gain of meiosis
E) loss of chloroplasts

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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the sphincter muscles at the end of the digestive tract is the anus.