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Lecture 5 Animal Evolution – The Invertebrates. 6. Roundworms. Tapered at both ends; protective cuticle covers it. Tough cuticle & flexible; molted repeatedly. Play vital roles in the cycling of nutrients in the ecosystem. Many are parasites.
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6. Roundworms • Tapered at both ends; protective cuticle covers it. • Tough cuticle & flexible; molted repeatedly. • Play vital roles in the cycling of nutrients in the ecosystem. • Many are parasites. • Elephantiasis – caused by roundworm.