Roundworm - a worm with a round, tube like body. Most are too small to be seen.
digestive system with 2 openings
take in food and eliminate waste
muscles that run length of body
nervous system with brain and simple sense organs
Adaptation - parasitic roundworms live in other animal’s body to get food and protection.
How do roundworms and flatworms differ? Roundworms have a digestive tract with two openings, muscles running lengthwise; flatworms can regenerate and have eyespots.