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

[EX Q]: Overharvesting is a serious threat particularly to which species?
[EX A]: aquatic species

[EX Q]: Which human body system is a complex network of nervous tissue that carries electrical messages throughout the body?
[EX A]: the nervous system

[EX Q]: In what energy industry process are fluids pumped through a borehole, creating fractures in the rock that contains the natural gas?
[EX A]:
fracking