Most flatworms live in aquatic environment. Their flat bodies allow them to undergo daily process such as respiration, excretion, internal transport through diffusion. They have organ level of organization, and thus, they are acoelomates, or no true body cavities. Cilia on the ventral side of free-living flatworms aid in movement. Flatworms are heterotrophic, so they do not rely on sunlight and can live in the dark. Some parasitic roundworms lack a nerve system to fit their parasitic nature.
Roundworms can complete respiration, excretion, and internal transport by diffusion as well. Parasitic roundworms produce eggs or zygotes that are immune to harsh environment to fit their complicated lifecycles.
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