Nature is a pice of heaven when it preserves unspoilt fauna and flora when plants and animals live freely in their natural habitat. Animals are eukaryotic and pluricellular organisms, separating them from bacteria and most of the antiscites, with heterotrophic feeding, usually digesting food in a digestive tract, separating them from plants and algae. They differ from plants, algae and fungi due to the lack of rigid cell walls and the fact that most animals are mobile, except for certain stages of development, or corals, sea sponges. Solve this test and find out how much do you know about animals!