three parts of cell theory
-all living things are made up of 1 or more cells
-all living cells arise from pre-existing cells by division
-the cell is the fundamental unit of structure and function in all living organisms
2 types of passive transport
diffusion and osmosis
4 types of active transport
molecular transport
bulk transport
endocytosis
exocytosis
levels of organisms from s-L
cell
tissue
organ
organ system