Horsehair worms, in the phylum Nematomorpha, do not have a respiratory system. They are usually found in puddles of water or on damp sidewalks and patios, or they may come wiggling out of insects. These creatures have no economic importance other than being parasitic to some insects. Based on this scenario, horsehair worms are most likely to

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Horsehair worms, lacking a respiratory system, likely rely on diffusion across their body surface for gas exchange. A large surface area relative to volume facilitates this process, allowing efficient oxygen intake and carbon dioxide expulsion.

Horsehair Worms, in the Phylum Nematomorpha, Do Not Have a Respiratory