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

[Q]: Human facial expressions can communicate emotions.
[A]: What can human facial expressions communicate?


[Q]: The endocrine system produces hormones to regulate growth, development, and reproduction.
[A]: Which human organ system produces hormones to regulate growth, development, and reproduction?


[Q]: Mammals have four limbs and produce amniotic eggs.
[A]:
Mammals have four limbs and produce what kind of eggs?