instruction:
Given a scientific question, generate a correct answer to it.
question:
What is making measurements that are close to the true value known as?
answer:
accuracy

question:
Hormones, ions, and neurotransmitters are all types of what?
answer:
chemical signals

question:
What incredibly successful species has quickly colonized almost all of earth's terrestrial habitats, but also impacted earth, its climate, and its environment?
answer:
humans