A divide is the highest ridge of terrain separating river basins. Divides can be relatively small and cover just a few dozen miles, or they can stretch thousands of miles. On either side of a divide, water drains into separate basins. Continue Reading.
Concept 2: Mitosis and the Cell Division Cycle. Cells that are growing and dividing go through a repeating series of events called the cell division cycle (or cell cycle). During the first phase (G1), the cell grows and prepares for DNA replication, which occurs in the subsequent S phase. Further growth takes place in the G2 phase, and finally mitosis occurs in the M phase. G1, S, and G2 are collectively called interphase.
The Cell Cycle. Though we frequently use the term mitosis to refer to the overall process of cell division, mitosis is actually only one phase of the cell cycle. The cell cycle is the orderly sequence of events that occurs from the time a cell divides to form two daughter cells to the time those daughter cells divide again.