Cell+Theory


 * __Cell Theory:__**

1. Cells are the basic building blocks of all living things. 2. All life activities take the place of cells. 3. New cells are produced by existing cells.


 * __What determines if something is "alive"?__ **

1. They must have the ability to acquire and use energy. 2. They must have the ability to reproduce. 3. They must have the ability to respond to the outside world. 4. They must have the ability to get rid of waste. 5. All living things are made of cells.
 * //ALL//** living things must have //**all**// of the following characteristics:

Some biologists also add **movement**, **growth** and **life span** to the list.