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In page Ascaris lumbricoides:

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Anatomically, the digestive tract is complete with prominent muscular pharynx. Respiration is by simple diffusion across body wall. The nervous system consists of a nerve ring and many longitudinal nerve cords. They are dioecious and have separate reproductive systems consisting of thread like gonads and genital ducts that open outside by apertures. Fertilization is internal and development is mostly indirect. Sexual dimorphism is well marked. Externally, males are much shorter than females and males also have a curved posterior end, unlike females. Internally, in males, all the digestive, reproductive systems open in a common chamber- cloaca whereas in females, there is a separate anus for digestive tract and female genital pore for female reproductive system.[citation needed]