Given the question: Answer the following question given this paragraph: In order to live on land and in water, frogs have three eyelid membranes: one is see-through to protect the eyes underwater, and the two other ones let them see on land. Frogs also have a tympanum , which acts like a simple ear. They are found on each side of the head. In some species, the tympanum is covered by skin. Q: How many eyelid membranes do frogs have? Choices: - two - four - one - three A:
The answer is:
three