Overall, life expectancy fell by one-tenth of a year, from 78.9 in 2014 to 78.8 in 2015, according to the latest data. The last time U.S. life expectancy at birth declined was in 1993, when it dropped from 75.6 to 75.4, according to World Bank data. The overall death rate rose 1.2 percent in 2015, its first uptick since 1999. More than 2.7 million people died, about 45 percent of them from heart disease or cancer.
The process by which new cells are made is called cell division. Cell division is occurring all the time. Around two trillion cell divisions occur in the average human body every day! Types of Cell Division. There are three main types of cell division: binary fission, mitosis, and meiosis.
Interphase accounts about 90%of the cycle; during interphase the cell grows and copies its chromosomes in preparation for cell division. Interphase is divided into sub phases: G 1 phase (first gap), the S phase (synthesis), and G 2 phase (second gap). The chromosomes are duplicated only during the S phase. During G 1 phase cell grows until S phase where the cell prepares for the cell division during G 2 phase. Based from human cell, M phase only takes about 1 hour while the S phase occupy about 10-12 hours.