Given a scientific question, generate a correct answer to it.

[EX Q]: What is continually released during childbirth through a positive feedback mechanism and prompts uterine contractions to fetal head toward the cervix?
[EX A]: oxytocin

[EX Q]: Overpopulation takes place when the number of organisms in an area exceeds what?
[EX A]: carrying capacity

[EX Q]: When light meets matter, it may be reflected, transmitted, or what?
[EX A]:
absorbed