Levels of organization

As you know, organisms can be:

- Unicelular if they are formed by only one cell (Prokaryote cells)

- Multicellular if they are formed by more than one cell (Eukaryote cells)

 In multicellular organisms, such as animals and plants, groups of cells work together to carry out different functions. These are called levels of organization. 

• A group of cells of the same type and with the same function form a tissue.
• When tissues join together they form an organ.
• A group of different organs working together makes up a system.
•  Finally, different systems join together to make an organism.

So, an organism is made up of systems; a system is made up of organs; an organ is made up of tissues and a tissue is made up od cells.

ORGANISM > SYSTEMS > ORGANS > TISSUES > CELLS

 

Watch this video to understand it better!!! :)