Animals are heterotrophic, meaning they rely on other organisms—plants and/or other animals—for their foods, as they can't synthesize their unique foods as vegetation do through photosynthesis. Vertebrates make up a self-contained group: the subphylum Vertebrata. Invertebrates belong to numerous groups. A crustacean’s human body is safeguarded by a hard exoskeleton. https://murrayi789toi4.iamthewiki.com/user