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.

Q: Question: What are the building blocks of peptides? Answer: amino acids

A: A peptide is composed of two or more amino acids. Amino acids are the building blocks of peptides.
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Q: Question: What preventive measure can protect even young children against diseases such as viral meningitis? Answer: vaccination

A: Children as young as 2 years of age can be vaccinated against viral meningitis.
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Q: Question: When traveling through space what do mechanical waves lose? Answer: energy

A:
An electromagnetic wave is a transverse wave that can travel across space as well as through matter. When it travels through space, it doesn't lose energy to a medium as a mechanical wave does.
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