Animals are heterotrophic, meaning they rely on other organisms—plants and/or other animals—for his or her food, as they can't synthesize their own foodstuff as plants do by using photosynthesis. Vertebrates make up a self-contained group: the subphylum Vertebrata. Invertebrates belong to a number of groups. A crustacean’s system is shielded https://genghisn123eav8.blogpixi.com/profile