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12 October, 10:43

What is an unifying characteristic of all crustaceans?

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  1. 12 October, 12:43
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    A hard exoskeleton made of calcium - no internal skeleton. The head has two compound eyes, two pairs of antennae, and three pairs of mouthparts. A pair of green glands excrete wastes near the base of antennae. The abdominal segments have swimmerets (swimming legs)
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