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Arthropods are invertebrates (animals without a backbone) with jointed legs and a hard exoskeleton (external skeleton). Within the arthropod group are insects (six legs), arachnids (eight legs), crustaceans (variable number of legs) and myriapods (millipedes and centipedes - many legs).

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14y ago
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12y ago

First you have to look at them carefully. Then u have to check if they have a backbone.

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12y ago

by the size

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Q: How can you identify a invertebrate?
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