What happens in prophase?

What happens in prophase?
Cell Division Crossword Puzzle
http://www.moomoomath.com/cell....-division-crossword-

Prophase is the first stage of mitosis.
During prophase, the chromosomes first begin to appear.
Next, the nuclear membrane begins to break down, and the centrioles produce mitotic spindle fibers.

Prophase resources

Mitosis
https://www.youtube.com/watch?v=cvlpmmvB_m4

Mitosis and Meiosis simulation
https://www.youtube.com/watch?v=zGVBAHAsjJM
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For more Life Science videos and summaries see,
http://www.moomoomath.com/Midd....le-School-Science-an