Organism.
cells < tissue < organs <organ systems
The sponge.
reflex action is that immediate response to the external stimuli which is provided for the spinal cord itself and not the brain and further the complex action is taken by brain by further thinking upon the matter
There are a number of different ways that common animal grow, respond, reproduce, and are organized. These animals can be organized based on their method of reproduction for example.
The structures of the human body in order from least to most complex are cell, tissue, organ, and organ system.
why are the number of plant systems smaller than animal systems.
nucleus
like a human
complex animals have no back bones and simple animals have backbones
First, animals are made of cells, those cells make up tissue, those tissues make up organs, which make up organ systems. Finally, the organ systems make up the animal.
whats a skimple animal
Amoebas belong to the Kingdom Protista. They are animal-like unicellular organisms.