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Tamara Medina
Biology
11 August, 10:03
Which applies to an earthworm but not to a hydra?
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Braeden Bates
11 August, 10:28
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I think the hydra lacks the specialized cells for touch and chemical detection. On the other hand earthworms have touch, light, vibration and chemical receptors along the entire body surface. Both of them are invertebrates (those animals without a backbone), they include insects, worms, jelly fish, spiders among other animals.
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