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

[EX Q]: What are the two most abundant elements in the universe?
[EX A]: hydrogen and helium

[EX Q]: Amphibian larvae go through what process to change into the adult form?
[EX A]: metamorphosis

[EX Q]: What do you call an abnormal mass of cells that is dividing improperly?
[EX A]:
tumor