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kipiarov [429]
3 years ago
15

What structures have parasite worms lost? What structures/organs are expanded?

Biology
1 answer:
Ne4ueva [31]3 years ago
6 0

Explanation:

Something that is lacking, is a circulatory system. Instead of a typical circulatory system flatworms exchange oxygen with the air outside through diffusion. This is the process by which gases will pass through a membrane from an area of high concentration to an area of low concentration.

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