Animals are heterotrophic, meaning they rely on other organisms—vegetation and/or other animals—for his or her foods, as they cannot synthesize their very own foodstuff as plants do by means of photosynthesis. The fossil document of animals goes again about 600 million several years on the Ediacaran period, or relatively previously. https://andreurmgx.wikiparticularization.com/1640125/animal_sex_fundamentals_explained