*1. All organisms composed of one or more cells.
*2. Cell is smallest living organizational unit.
*3. Cells arise only from division of other cells.
Types of Cells
1. Prokaryotic cells ------- 2. Eukaryotic cells
2) Eukaryotic cells: More modern, complex cells. Examples: Cells of Plants, Animals, & Fungi.
Simplest organisms: Very small size.
Strong cell walls: resistant to environmental changes.
Lack membrane-bound organelles inside the cell.
No nucleus. (They have DNA)
Movement: Some can't move, while others have long threadlike flagella.