Examlex
List the numbers in the set that are natural numbers.
Reflexes
Automatic, involuntary responses to certain stimuli that serve protective roles, such as the knee-jerk reflex.
Chemical Messenger
Substances in the body such as hormones and neurotransmitters that transmit signals from one cell to another.
Mood
A temporary state of emotion or feeling that can influence an individual's perception, behavior, and well-being.
Sleep
Periodic, natural loss of consciousness—as distinct from unconsciousness resulting from a coma, general anesthesia, or hibernation.
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