The decline of brachiopods and stalked crinoids, which began during Cretaceous, was probably the result of

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Quizplus · Accepted Answer

The diversification of modern predators, including crabs, fishes, and snails, is the most likely reason for the decline of brachiopods and stalked crinoids during the Cretaceous period. These predators were better equipped to hunt and feed on these organisms, leading to their decline. The other options are not supported by scientific evidence. Brachiopods and stalked crinoids did not hide in coral reefs and only come out at night or have the ability to actively swim or burrow as a defense against predators. They also did not have defensive spines or unusually heavy protective shells that could protect them from predation.

The Decline of Brachiopods and Stalked Crinoids, Which Began During