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6 April, 22:44

Jack covers his ears when he hears a loud sound. Which statement is correct? 1. Jack's peripheral nervous system sends a message to the sense organs to make him respond. 2. Jack's brain sends a message to the sensory neurons to make his bones and muscles move. 3. Jack's central nervous system instructs his hand muscles to move towards his ears. 4. Jack's central nervous system sends impulses through the spinal cord to the brain.

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  1. 7 April, 01:00
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    The correct answer is 3.
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