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cactus flowers
What did Charles Darwin discover about this plant?

Answer:

Most people focus so much on Darwin's contributions to the science of evolution that they forget his other achievements. He made marvelous achievements in the study of everything from barnacles to orchids. One thing that he discovered was that the stamens of the prickly pear flower would respond to touch by curling inwards. This brings the pollen in contact with a bee or other insect that comes to the flower for nectar. I thought this was worth making a short video, so you could see it in action.
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