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: The female reproductive system consists of structures that produce eggs, secrete female sex hormones, and ultimately enable birth of a fetus.

Answer: What system consists of structures that produce eggs, secrete female sex hormones, and ultimately enable birth of a fetus?


Question: Are humans a new or old species on the earth?

Answer: Are humans a new or old species on the earth?


Question: Stationary front weather phenomenon, which may bring clouds and precipitation, is created by stalled air masses.

Answer:
What weather phenomenon, which may bring clouds and precipitation, is created by stalled air masses?