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In Reply to Disinfo Agent's comment: I don't get the connection between insects and dinosaurs. Also, insects do not quite breathe through their skin. They mostly use a network of tiny hollow tubes called trachea.
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Hi Disinfo Agent,
The following is an excerpt from the Wikipedia article that you linked to.
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Unlike vertebrates, insects do not generally carry oxygen in their hemolymph; this is one of the factors that may limit their size.
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