how many people know that spider is not insect?

March 21, 2009 9:30am CST
Spider is not insect, it has 8 legs while insect has 6 legs. And its body divide to 2 parts:head and abdomen. but insect's body divide to 3parts: head, abdomen and bosom. I always think that spider is one kind of many people make the same mistake?
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