Reflex
A stereotyped nerve response that occurs immediately at the level of the spinal cord or brainstem, without conscious deliberation. It is a different concept from the reflection of light.
A Venus flytrap doesn't snap shut on the first touch. One trigger-hair touch arms the trap; a second within 20–40 seconds fires it. This avoids wasting energy on raindrops or debris. A third touch in the window signals struggling prey and starts digestive enzymes.
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