Final answer:
Roundworms have an entire digestive system, can be parasitic, and do not have radial symmetry.
Step-by-step explanation:
Characteristics of a roundworm include
- Has an entire digestive system: Roundworms have a complete digestive system with both a mouth and an anus, allowing for efficient digestion and waste elimination.
- Can be parasitic: About half of the roundworm species are parasitic, meaning they live in or on other organisms and obtain nutrients from them.
- Does not have radial symmetry: Roundworms do not have radial symmetry; instead, they have bilateral symmetry, meaning their bodies can be divided into equal halves along a single axis.