2) some cells have several nuclei per cell. how could such multinucleated cells be explained? a) the cell underwent repeated mitosis, but cytokinesis did not occur. b) the cell underwent repeated mitosis with simultaneous cytokinesis. c) the cell underwent repeated cytokinesis but no mitosis. d) the cell had multiple s phases before it entered mitosis.

The correct answer is a) The cell underwent repeated mitosis, but cytokinesis did not occur.

Explanation:

Multinucleated cells go through mitosis and form many nuclei but as there's no cytokinesis involved, therefore, the cell never actually separates. This type of cells, that are formed with a process of the mitosis without cytokinesis is called coenocyte.  

telophase and anaphase

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.