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: What are generally divided into prosimian and non-prosimian? Answer: primates
Primates are generally divided into prosimian and non-prosimian primates.

Question: What long molecules are composed of chains of units called monomers? Answer: polymers
Polymers are long molecules composed of chains of units called monomers.

Question: What is the method of reproduction for echinoderms? Answer: external fertilization
Echinoderms generally reproduce by external fertilization; regeneration is fairly common among echinoderms.