On cells
There are many two subgroups of cells, the eukaryotic and prokaryotic cells. The eukaryotic cells are then compromised of two major groups, the animal and plant cells. Each animal and plant cells are then split up into a variety of different organelles. These organelles work together to allow the cell to work, similar to how an organization, or building, for example, is run. Different cells also have different purposes. There are cells that work in an animal's immune system and digestive system that each allow it to perform different tasks.
Below are a group of cells. Inside, one can see the nucleus, the large blue orb inside the cell.
Below are a group of cells. Inside, one can see the nucleus, the large blue orb inside the cell.