instruction:
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.
question:
Question: What is the main function of the cardiovascular system? Answer: to transport
answer:
Many ecosystems have changed because of human actions. The human species is responsible for a range of environmental problems.

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Question: Stis are diseases caused by what that spread through sexual contact? Answer: pathogens
answer:
STIs are diseases caused by pathogens that spread through sexual contact. Abstinence from sexual activity and other risk behaviors is the only completely effective way to prevent the spread of STIs.

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Question: Like bacteria, archaea can have what to assist with movement? Answer: flagella
answer:
Like bacteria, archaea can have flagella to assist with movement.