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

Q: Resonance is the term for the use of two or more lewis structures to represent the covalent bonding in a molecule.

A: What is the term for the use of two or more lewis structures to represent the covalent bonding in a molecule?
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Q: The pressure of ocean water increases rapidly as the water gets deeper.

A: What property of ocean water increases rapidly as the water gets deeper?
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Q: Sertoli cells cells secrete signaling molecules that promote sperm production and can control whether germ cells live or die.

A:
What cells secrete signaling molecules that promote sperm production and can control whether germ cells live or die?
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