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.
The Chinese. All other cultures most like did not support astronomy.
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It depends on the age of people using it at that time, but you can always try
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a human and a fish also bacterium
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