Solve the riddle:
What must be in the oven yet cannot be baked?
Grows in the heat yet shuns the light of day?
What sinks in water but rises with air?
Looks like skin, but is fine as hair?

Below you will find a hint and the correct answer to the riddle.
Little hint:
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Hint: Y*a*t.
Right answer:
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Answer: Yeast.