The Cell Theory 1. All organisms are made up of one or more cells. 2. Cells are the basic unit of life. 3. All cells arise from pre-existing cells

All living Things are composed of CELLS bacteria amoeba mice horses flowers yeast trees mushrooms protozoadiatoms

Viruses are not considered cells! HIV Cold chicken pox

Cells that EXIST by themselves are called single-celled organisms amoeba bacteria

Organisms that are made up of more than one cell are called multicellular organisms plants animals

Other names and spellings Single-celled Singlecelled Unicellular Multi-celled multicellular

Where do Cells come from?

+ = ? Spontaneous Generation

+ = Spontaneous Generation

+ = Spontaneous Generation

All cells come from pre-existing cells in process called Cell Division

Recite the Cell Theory  1.  2.  3.