In many simple animals like sponges, jellyfish, and flatworms, the circulatory system is not involved in gas transport because they rely on diffusion to exchange gases directly with the environment. In other animals, such as insects, the circulatory system also does not transport gases; instead, they use a network of tubes called a tracheal system to deliver oxygen directly to their tissues.
In which animal is the circulatory system not involved in gas transport?
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