Biology Introduction Biology is the study of life and living organisms

Biology Introduction Biology is the study of life and living organisms. HIERARCHY OF THE BODY The human body can be studied at different levels. Organs such as the stomach can be grouped into organ systems (digestive system) or can be studied on a smaller scale like the cellular level. The ranking of these levels is called a hierarchy. The smallest organization unit is the atom. Individual atoms are grouped into larger structures called molecules. These in turn make up organelles, which are part of the larger, more complicated system called cells. Cells are the structural and functional units of life. Cells are clustered into tissues. Organs are discreet units made up of two or more tissues, and organs are grouped into organ systems that compose the organism. Label the levels of the hierarchy and color each item a different color