Why are an earthworm, snail and cockroach called invertebrates?
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Invertebrates are animals without a backbone or bony skeleton. They range in size from microscopic mites and almost invisible flies to giant squid with soccer-ball-size eyes. This is by far the largest group in the animal kingdom: 97 percent of all animals are invertebrates.
Examples: earthworm , snail , cockroach and etc.
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