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 do scientists believe are the oldest eukaryotes? Answer: protists
[EX A]: Scientists think that protists are the oldest eukaryotes. They most likely evolved from prokaryotic cells, as explained by the endosymbiotic theory. This theory is well-supported by evidence.

[EX Q]: Question: What are genes that are close together on the same chromosome called? Answer: linked genes
[EX A]: Linked genes are genes that are close together on the same chromosome. Linked genes are inherited together.

[EX Q]: Question: The four phases of mitosis are prophase, metaphase, anaphase and what? Answer: telophase
[EX A]:
Mitosis occurs in four phases, called prophase, metaphase, anaphase, and telophase.