What are the main points of the cell theory of life

The main points of the cell theory are:

1. The cell is the SMALLEST living unit of life.

2. The cell is so small is it is not visible to the naked eye.

3. The shape of the cell can vary based on the different lifeforms they are in.

4. The size of the cell also varies.

5. All living organisms or lifeforms are made from cells.

6. Cells originate from a pre-existing cell, in multicellular lifeforms, then the pre-existing cell will divide into many other cells with the process repeating.

7. All cells retain the same properties, such as growth, respiration, and etc.

i need

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.