Answer :
in animal cells, the cell membrane pinches and separates to form two new nuclei
Cytokinesis is the step of the cell cycle in which the cell must faithfully separate the chromosomes and cytoplasm, yielding two daughter cells.
What is cell cycle?
A cell cycle is a series of events that takes place in a cell as it grows and divides. A cell  replicates its chromosomes, and prepares for cell division.
Cytokinesis is the step of the cell cycle in which the cell must faithfully separate the chromosomes and cytoplasm, yielding two daughter cells.
Image of cytokinesis is attached.
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