Biology (ecology) There are ecological implications for areas with a fast doubling time. Using complete sentences describe four ecological implications (affecting both the human populations as well as other organisms on the planet.) Label the four ecological implications A,B,C,and D. Solution The doubling time is the period of time required for a population to double, it is a concept that is applied to growth of a population. The ecological implications for areas with a fast doubling time are as follows: A: Availability of resources like food B: Prevalence of diseases C: Prevalence of predators D: Lack of space.