Huge mountains, like the Himalayas are created when the continental crusts collide and fold into each other. This causes the earth to slowly start rising into mountain peaks, which cause the mountains to appear.
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A. the magnitude of an earthquake
Tailings is the right answer.
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.
