Because if there weren't any variation in a population, then there would be competition so more animals/ organisms would die.
Adaptation
8,858,000 people
2011 estimate1,191,264,000
Approximately 8 billion
around 36 million
worldwide it is 1.897 Billion
Roughly 9 million.
Because on very, very rare occasions the variation may be helpful
Russia's population is 140702000 in 2011
cellular cloning is the process of making a populaion of cells from a single cell. cellular cloning is the process of making a populaion of cells from a single cell. cellular cloning is the process of making a populaion of cells from a single cell.
The population of Chicago, as estimated in 2011, was 2,707,120.
the increase of populaion