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19. Arthropods A) first appear in the fossils of the Cambrian exploson ) were the second animal phyla to coionize iand @account for 40% of aildocumented extrotons ofarma seces include leeches and earthworms all of the above

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ARTHRofoDA: an exockelblory, A smenin bholy pie iis a bod う[hby.hame ewen o mntion, Juwa, 8°./. 업 all duw amces axthsopods d

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