What occurs during prophase in animal cells?
1) fragmentation of the nuclear envelope
2) nucleolus disappears
3) stained chromosomes become visible
4) centrioles replicate
1 )
A: 1, 2, 3 and 4
B: 1, 2 and 3 only
3 )
C: 2 and 3 only
4 )
D: 1 and 4 only
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