Part A

Choose the pronoun error in the paragraph.

Not all ocean-dwelling creatures are fish. Animals that live in the sea include mammals, crustaceans, and even birds! These animals all have unique features that make it possible for [it] to survive and thrive in a watery world. Mammals, such as whales and sea lions, have a thick layer of fatty tissue called blubber. The blubber insulates [them ] against the cold waters of the deep sea.

Part B
Enter the pronoun that corrects error from part A