The Levels of Organization


Definition of Cell: are the basic unit of all living things.

Three examples of Cells:Sperm Cell,Human Cell,Nerve Cell

This is what a cell looks like but there is different types of cell


Definition of Tissues:made of a group of similar cells that work together to do a certain job to help the body.

Three examples of tissues:muscle tissue,the lining of the intestine,root hair tissue.

This is a picture of tissue but this is only one so there is still more different tissues


Deffention of Organs:made up of two or more tissues that work together to do a certain job in the body.

Three examples of Organs:heart,lung,stomach

This is a picture of an organ this is only one of them but there is many other organs

Organ Systems

Definition of organ system:An organ system is a group of organs working together to perform a certain job.

Three examples of Organ Systems:Circulatory System,Digestive System,Nervous System.

This is a picture of the organ system but there is still more types of organ systems


Definition of organisms:Sum of all cells, tissues, organs and organ systems makes an organism. An organisms is made when a group of organ systems work together.

Three examples of organisms:Bacteria,Humans,Animals.

picture of organisms


Each one of the levels need each other because if one level was gone all the other levels would not work.Because you need all the tissues and organs to have organisms.