Which is a part of the cell theory? cells come from pre-existing cells cells have a nucleus organisms with one cell must be seen with a microscope organisms must have more than one cell to live

Cells come from pre-existing cells.

The correct answer is option A, cells come from pre-existing cells.

There are three major concepts of the cell theory and these are as follows:

1) There are numerous cells in an organism. Thus, it can be stated that all organisms  are made of one or more cells.  

2) Each cell has a specific job or function.

3) All cells evolve from their parent cell ( or already existing cells)

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more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem