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 interferons? Answer: cytokines
[A]: Figure 42.4 Interferons are cytokines that are released by a cell infected with a virus. Response of neighboring cells to interferon helps stem the infection.

[Q]: Question: Which cycle tracks the flow of nitrogen through an ecosystem? Answer: nitrogen cycle
[A]: Mariana Ruiz Villarreal (LadyofHats) for CK-12 Foundation. The nitrogen cycle tracks the flow of nitrogen through an ecosystem . CC BY-NC 3.0.

[Q]: Question: Reflected in their relatively high level of intelligence and their ability to learn new behaviors, what organs tend to be relatively large in primates? Answer: brains
[A]:
Primates tend to have bigger brains for their body size than other mammals. This is reflected in their relatively high level of intelligence and their ability to learn new behaviors.