How does the nictating membrane help a frog underwater?
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by covering the eyes under water.
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Most frogs also have a nictitating membrane, or a sturdy film that covers and protects the eye while the frog is underwater. ... That means a frog can't use its tongue to push food down its throat and toward its stomach. For this reason, when a frog swallows, its eyes sink down into its skull to help push the food along.
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