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Explain how a population's age structure affects whether it will grow or decline.
Stomach
An organ in the digestive system that secretes acid and enzymes to digest food before it moves into the small intestine.
Conditioned Stimulus
A formerly neutral signal that, once linked with an unconditioned stimulus, ultimately leads to eliciting a conditioned response.
Unlearned Reaction
An instinctive response to a stimulus that does not require previous experience or learning.
Reflexive Response
An automatic reaction to a specific stimulus without conscious thought, often as a protective mechanism.
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