The final stimulus that convinced Darwin to publish his findings came from a young English naturalist, Alfred Russell Wallace who had come to the same conclusion as Darwin from his own observations.
Alfred Russell Wallace, a young English naturalist who had drawn the same conclusions from his own observations as Darwin had, served as the final impetus for Darwin to publish his discoveries. A stimulus is described as "a discernible change (physical or chemical) in an organism's environment that results in some functional activity."
For instance, the stimulus provided by sunlight causes plants to develop or move toward it. High temperatures, for instance, cause our bodies to activate (stimulate) the sweat system, which results in a cooling of our bodies. Because of our sensitivity to temperature, we can identify hot and cold conditions.
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