Who were the tribes the Lewis and Clark encountered in North Dakota? Had the Mandan and Hidatsa ever seen an African-American before? How did tribes fare in the wake of the expedition?
The flatworms, flat worms, Platyhelminthes, Plathelminthes, or platyhelminths (from the Greek ÏÎ»Î±ÏÏ, platy, meaning flat and á¼Î»Î¼Î¹Î½Ï (root: á¼Î»Î¼Î¹Î½Î¸-), helminth-, meaning worm) are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
Vertebrates and invertebrates aren't kingdoms at all, they are phyla (singular phylum). The duck billed platypus is a vertebrate because it has a backbone. It belongs to the animal kingdom. The other kingdoms are plants, fungi, protists, monera.ertebrates and invertebrates aren't kingdoms at all, they are phyla (singular phylum). The duck billed platypus is a vertebrate because it has a backbone. It belongs to the animal kingdom. The other kingdoms are plants, fungi, protists, monera.