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

Q: Plankton is the most common life form in the ocean.

A: What is the most common life form in the ocean?
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Q: How much is involved in the reaction does the coefficient in front of an element in a formula indicate.

A: What does the coefficient in front of an element in a formula indicate?
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Q: Cells acquire different identities in an ordered spatial arrangement during morphogenesis.

A:
When do cells acquire different identities in an ordered spatial arrangement?
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