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Science (Please help!)

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I have a few questions to ask:
1. Round worms make up the largest phylum of worms, the phylum _________
2. many nematodes are parasitic, but most are _______
3. Wastes leave the body of a roundworm through an opening at the end of the digestive tract called the ______
4. Humans get _____ by walking barefoot over dirt or through fields.

Thank you for your help! :)

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