#multicellular

• Animal — A living, multicellular, heterotrophic organism with a eukaryotic cellular structure lacking a rigid wall, generally capable of voluntary movement and rapid responses to environmental stimuli through a nervous system. In a broad sense, the kingdom to which these beings belong comprises an immense structural diversity, from microscopic invertebrates to complex mammals. As an adjective, it describes a phenomenon, an organic function, or a product belonging to or originating from these organisms.