Animals are heterotrophic, which means they depend upon other organisms—crops and/or other animals—for his or her food items, as they can't synthesize their own foods as vegetation do by means of photosynthesis. The fossil history of animals goes back again about 600 million years to your Ediacaran time period, or https://devinlgzsk.ktwiki.com/1608654/5_simple_statements_about_animal_xxx_explained