(Question)
Q: What is the term for something in the environment that causes a reaction in an organism? Choices: - pollution - crisis - climate - stimulus A:
(Answer)
stimulus

(Question)
Q: Mercury and lead, which was once widely used in paint and gasoline, are examples of what type of metals? Choices: - gaseous heavy metals - alloys - sulfuric heavy metals - toxic heavy metals A:
(Answer)
toxic heavy metals

(Question)
Q: What system carries messages from sense organs and internal organs to the central nervous system? Choices: - sensitive nervous system - respiratory system - auxiliary nervous system - peripheral nervous system A:
(Answer)
peripheral nervous system