What are 3 differences crayfish have with annelids?

1. Body structure: Crayfish have a segmented body, but their segments are not as well-defined as those of annelids. Crayfish also have a hard exoskeleton, while annelids have a soft body.

2. Appendages: Crayfish have two pairs of antennae, two pairs of maxillipeds, and five pairs of walking legs. Annelids have no antennae and only a single pair of maxillipeds.

3. Habitat: Crayfish are found in freshwater environments, while annelids can be found in both freshwater and marine environments.