Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: Urea is made in the liver and excreted in urine.

A: What is made in the liver and excreted in urine?
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Q: A concave lens is thicker at the edges than it is in the middle.

A: What type of lens is thicker at the edges than it is in the middle?
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Q: The ocean basin begins where the ocean meets land.

A:
The ocean basin begins where the ocean meets what?
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