Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[EX Q]: Question: What is defined as a group of living and nonliving things and their environment? Answer: ecosystem
[EX A]: An ecosystem is a group of living things and their environment. It is made up of both living and nonliving things.

[EX Q]: Question: When two haploid gametes unite during fertilization they form what? Answer: a diploid cell
[EX A]: diploid cell that forms when two haploid gametes unite during fertilization.

[EX Q]: Question: Tropical rainforests are an example of a climate that occurs near what? Answer: equator
[EX A]:
Tropical wet climates occur at or very near the Equator. They have high rainfall year round. Tropical rainforests ( FIgure below ) grow in this type of climate.