instruction:
Given a scientific question, generate a correct answer to it.
question:
What are required when the damage from trauma or infection cannot be closed with sutures or staples?
answer:
skin grafts

question:
Ionic compounds contain cations and anions rather than what?
answer:
discrete neutral molecules

question:
What is the term for a dynamic equilibrium that is maintained in body tissues and organs?
answer:
homeostasis