Given a scientific question, generate a correct answer to it.
--------
Question: What is the term for a symbiotic relationship in which one species benefits while the other species is not affected?

Answer: commensalism

Question: Name the fever that is caused by a virus that has antigens similar to molecules in human heart tissues.

Answer: rheumatic fever

Question: What makes up the core of the endoskeleton?

Answer:
vertebral column