What are the three main points of the cell theory?

1. All living things are made up of cells.

Example: Humans are made of cells, animals are made of cells, plants are made of cells...

2. Cells are the smallest units. Indeed, it is the smallest unit of life and it is as fundamental for biology as the atom is in chemistry

3. All cells come from preexisting cells through the process of cell division.

So, cells come from previous cells that went through a process of cell division, and during that division a new cell was created.

Hope this helps :)

i think the answer is d.