Overtime the variation that gives an advantage
Becomes more common in the population
Can limit the number of individual organisms
Becomes less common in the population
Can limit the number of selective pressures
acting on the population
This process is known as natural selection, where advantageous variations in a population become more prevalent over time as they provide a survival and reproductive advantage. This can ultimately lead to the decrease in diversity and number of individual organisms in a population as those with less advantageous variations are outcompeted. This process can also reduce the number of selective pressures acting on the population as the advantageous variations become more common and widespread.