| − | Biologically, an animal is any member of the Animalia kingdom. Animals must eat plants or other organisms to survive. The plants are called "producers" and the animals are "consumers". Scientists call consumers [[heterotroph]]s. Animals have complex [[eukaryotic]] cells, unlike bacteria which have much simpler cells. | + | Biologically, an animal is any member of the Animalia kingdom. Animals must eat plants or other organisms to survive. The plants are called "producers" and the animals are "consumers". Scientists call consumers [[heterotroph]]s. Animals have complex [[eukaryote|eukaryotic]] cells, unlike bacteria which have much simpler [[prokaryote|prokaryotic]] cells. |