Answer:
1. platyhelminth
2. invertebrates
Explanation:
1. flatworm, also called platyhelminth, is any of the phylum Platyhelminthes, a group of soft-bodied, usually many flattened invertebrates. A number of flatworm species are free-living, but about 80 percent of all flatworms are parasitic—i.e., living on or in another organism and securing nourishment from it.
2. Invertebrates - animals without a backbone. ... Sponges, corals, worms, insects, spiders, and crabs are all sub-groups of the invertebrate group - they do not have a backbone. Fish, reptiles, birds, amphibians, and mammals are different sub-groups of vertebrates - they all have internal skeletons and backbones.
