Type Roundworms are a large group of animals with a long, round cross-sectional body that is usually pointed at the anterior and posterior ends. Roundworms are characterized by the presence of free space inside the body – the primary cavity. It contains internal organs surrounded by cavity fluid. Washing the cells of the body, it participates in gas exchange and transfers substances. The body of the roundworms is covered with a strong shell – the cuticle. Their digestive system begins with the mouth and ends with the anus, that is, through. Roundworms are usually dioecious and reproduce sexually.
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