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microscopic ⪢⪢
You will often see snakes flicking their tongue in and out. Again this snake is not being rude. It is actually tasting the air - collecting microscopic particles which it can analyze using a special organ in the roof of its mouth.
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vertebrate ⪢⪢
Snakes are also vertebrates which means that they have a backbone. Actually snakes are almost ALL backbone! A snake's skeleton is most made of its skull, the vertebrate (or bones of the spine) and ribs.
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