Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Most hormones are produced by the endocrine system.

Answer: Most hormones are produced by which human organ system?


Question: When an atom gains or loses an electron it becames a(n) ion.

Answer: When an atom gains or loses an electron it becames an?


Question: Roots grow in length and width from the primary and secondary meristem.

Answer:
Roots grow in length and width from the primary and secondary what?