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a structure that is used by molluscs for feeding. It is a minutely toothed, chitinous ribbon...

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birds without a keel on their breastbones and therefore unable to fly, for example ostriches....

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the process whereby useful molecules, such as glucose and amino acids, as well as water and...

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nerve cells that receive stimuli.

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the last part of the mammalian large intestine, which stores faeces until it can be expelled...

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