An invertebrate is an animal lacking a vertebral column. The group includes 97% of all animal species — all animals except those in the Chordate subphylum Vertebrata (fish ...
This innovative, high quality education project embeds 3rd - 8th grade core curriculum while it extensively engages, cultivates collaboration skills, and produces proficient ...
The Origin and Evolution of Animals (Metazoa) We do not yet know from what group(s?) of eukaryotes the animals evolved. It occurred in Precambrian times. Before the Cambrian was ...