Animals must eat [[plant]]s or other organisms to survive. The plants are called "producers" and the animals are "consumers". Animals have complex [[eukaryotic cell]]s, unlike bacteria which have much simpler [[prokaryote|prokaryotic]] cells. Animal cells do not have [[cell wall]]s, only structural [[protein]]s in the [[cell membrane]]; this allows the animal cell a degree of flexibility. | Animals must eat [[plant]]s or other organisms to survive. The plants are called "producers" and the animals are "consumers". Animals have complex [[eukaryotic cell]]s, unlike bacteria which have much simpler [[prokaryote|prokaryotic]] cells. Animal cells do not have [[cell wall]]s, only structural [[protein]]s in the [[cell membrane]]; this allows the animal cell a degree of flexibility. |