(Question)
Q: What is the term for something in the environment that causes a reaction in an organism? Read this paragraph and choose the correct option from the provided answers: When a living thing responds to its environment, it is responding to a stimulus. A stimulus ( stimuli, plural ) is something in the environment that causes a reaction in an organism. The reaction a stimulus produces is called a response . 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? Read this paragraph and choose the correct option from the provided answers: Toxic heavy metals include mercury and lead. Mercury is used in some industrial processes. It is also found in fluorescent light bulbs. Lead was once widely used in gasoline, paint, and pipes. It is still found in some products. 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? Read this paragraph and choose the correct option from the provided answers: The sensory division of the peripheral nervous system carries messages from sense organs and internal organs to the central nervous system. For example, it carries messages about images from the eyes to the brain. Once the messages reach the brain, the brain interprets the information. Choices: - sensitive nervous system - respiratory system - auxiliary nervous system - peripheral nervous system A:
(Answer)
peripheral nervous system