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Where does stimulus occur?

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Assuming you are referring to the different types of "environmental stimuli," as in biology, the answer would include many sources. All living things (organisms) respond to environmental stimuli; this is one of the seven key characteristics of living things (including evolution, order, regulation, growth and development, reproduction, and energy utilization). So, for example, our bodies can respond to physical damage by making us aware of it through our feeling of pain. The "fight or flight" response can be triggered by threatening environmental stimuli. Or, a Venus fly trap will snap shut when an insect lands in its trap.
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How does threshold stimulus occur?

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The briefest of memories that occurs immediately following the reception of a stimulus?

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Why muscle contraction doest not occur below threshold stimulus?

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What is the response to the conditioned stimulus that occurs after the pairing of a conditioned stimulus and an unconditioned stimulus?

You will get a conditioned response. Since i know that this topic can be complicated i'll try and make it a little easier to understand. An unconditioned stimulus is one that