Which of the following describes why ecologists can use per capita growth rate to help predict how a population will grow? 1) Because per capita growth rate measures the average number of offspring produced by each individual in a population 2) Because per capita growth rate accounts for both births and deaths in a population 3) Because per capita growth rate is unaffected by factors such as immigration and emigration 4) Because per capita growth rate provides a more accurate measure of population growth than total population size