Hurricane Odile was the most powerful storm to hit Cabo San Lucas on the Baja California peninsula in Mexico. A Category 3 hurricane when it made landfall, Odile had winds of 125 mph. But the hurricane is losing strength as it moves north.
The cell cycle or cell-division cycle is the series of events that take place in a cell leading to its division and duplication of its DNA (DNA replication) to produce two daughter cells. In bacteria, which lack a cell nucleus, the cell cycle is divided into the B, C, and D periods. The B period extends from the end of cell division to the beginning of DNA replication. DNA replication occurs during the C period.
For an organism to grow, rebuild tissues, and reproduce, cells must divide. Every division requires replicating and then evenly dividing the cell's massive jumble of DNA. This video segment, adapted from the Interactive Secret of Life videodisc, follows the stages of mitosis, the systematic process that ensures that daughter cells formed when plant and animal cells divide get equal shares of DNA.