levels of organization
1.cells-the microscopic building blocks-1.amoeba 2.red blood cell 3.white blood cell
2.tissues-the form of cells-1.skin 2.muscle 3.fat
3.organs-the parts in an organism 1.large intestine 2.heart 3.veins
4.organ systems-system of parts in an organism 1.cardiovascular system 2.respiratory system 3.nerve system
5.organisms-living form of life- 1.humans 2.cats 3.dogs
the cell makes up the tissue. the tissue makes up the organs. the organs make up the organ system which makes up the organs.