Roundworms, also known as nematodes, are a type of parasitic worm. They have a simple, tubular structure and are characterized by their elongated, cylindrical, and unsegmented bodies which taper at both ends.

Here's a step-by-step description of the general features of roundworms:

1. **Body Shape and Size**: Roundworms have a cylindrical body that tapers at both ends. They are usually microscopic, but some species can grow up to 1 meter in length.

2. **Cuticle**: The body of a roundworm is covered by a tough and protective outer layer known as the cuticle. This cuticle is periodically shed and replaced as the worm grows.

3. **Digestive System**: Roundworms have a complete digestive system with two openings: the mouth and the anus. The mouth is located at the anterior end and the anus at the posterior end. Food travels from the mouth through a straight tube to the anus.

4. **Reproductive System**: Roundworms are usually dioecious, which means there are separate male and female individuals. The females are generally larger than the males. They have a complex reproductive system with the ability to produce a large number of eggs.

5. **Nervous System**: The nervous system of roundworms is rather simple. It consists of a ring of nerve cells around the pharynx, which sends out nerve fibers to all parts of the body.

6. **Muscular System**: Roundworms have longitudinal muscles along the length of their body. However, they lack circular muscles, which means they can only move in a thrashing, side-to-side motion.

7. **Respiratory and Circulatory System**: Roundworms do not have a specialized respiratory or circulatory system. They respire and circulate nutrients directly through their body wall and tissues.

Unfortunately, I can't provide a labeled diagram here, but you can easily find diagrams of roundworms in biology textbooks or online. Just make sure to look for the features I've described above.

Question

Roundworms, also known as nematodes, are a type of parasitic worm. They have a simple, tubular structure and are characterized by their elongated, cylindrical, and unsegmented bodies which taper at both ends.

Here's a step-by-step description of the general features of roundworms:

1. **Body Shape and Size**: Roundworms have a cylindrical body that tapers at both ends. They are usually microscopic, but some species can grow up to 1 meter in length.

2. **Cuticle**: The body of a roundworm is covered by a tough and protective outer layer known as the cuticle. This cuticle is periodically shed and replaced as the worm grows.

3. **Digestive System**: Roundworms have a complete digestive system with two openings: the mouth and the anus. The mouth is located at the anterior end and the anus at the posterior end. Food travels from the mouth through a straight tube to the anus.

4. **Reproductive System**: Roundworms are usually dioecious, which means there are separate male and female individuals. The females are generally larger than the males. They have a complex reproductive system with the ability to produce a large number of eggs.

5. **Nervous System**: The nervous system of roundworms is rather simple. It consists of a ring of nerve cells around the pharynx, which sends out nerve fibers to all parts of the body.

6. **Muscular System**: Roundworms have longitudinal muscles along the length of their body. However, they lack circular muscles, which means they can only move in a thrashing, side-to-side motion.

7. **Respiratory and Circulatory System**: Roundworms do not have a specialized respiratory or circulatory system. They respire and circulate nutrients directly through their body wall and tissues.

Unfortunately, I can't provide a labeled diagram here, but you can easily find diagrams of roundworms in biology textbooks or online. Just make sure to look for the features I've described above.

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