The Levels of Organization

cell is the basic unit of structure,  Cells are specialized by size and shape, Red blood cells , volox, and amoeba


Tissues are made of a group of similar cells, that work together to do a specific job in the body. epithelial, muscle, nervous, and connective.

Organs are made up of two or more tissues,that work together to do a specific job.

heart, kidney,liver

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

the cells make the tissues the tissues. the tissues   make the organs the organs make the organism . if We did not have the cells we will not have a human body or any other organism.