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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prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.