Given a scientific question, generate a correct answer to it.

[Q]: The hemolymph and body cells exchange chemicals within what body part?
[A]: the sinuses

[Q]: A synergist that makes the insertion site more stable is called a what?
[A]: fixator

[Q]: Induced mutations are caused by environmental factors. what term is used to describe a mutation that has no environmental cause?
[A]:
spontaneous mutation