Population increase has a positive relation with the demand for resources (Miller, 2005). Carry capacity plays the role of defining a suitable population size, which an environment can comfortably accommodate at a time. The rate at which a population of human, plant or animal can grow, is normally determine by the amount of resources available in an environment. An environment with more resources will experience a faster population growth rate and vice versa (American Geological Institute, 2011). Exponential growth rate is a continuous growth rate that is supported by the availability of unlimited essential resources. However, population increase can experience some certain forms of environmental resistance that can prevent population growth rate from achieving its maxima. Such resistances are relevant as they determine the carrying capacity of a particular environment and hence the population of individuals in a region.
Exponential growth entails the population, which grow continuously (Miller, 2005). In this type of population growth, the reproduction of individuals occurs at any time, for instance, the humans, who have no reproduction periods. In exponential growth, population increases shoots up within a small time-period and these results to a substantial straining in the environmental carrying capacity. On the other hand, logistic growth rate entails the population growth, where the population growth rate begins to level off due to limiting factors in the environment (American Geological Institute, 2011). There are several factors that limit exponential growth and in the course, leading to logistic growth in a population. These factors tend to be weaker when population is at low levels, while get stronger as population experiences increases. As a result, the population starts leveling off towards an equilibrium, which is known as the carrying capacity. It is at the stable equilibrium, where the environment is capable of comfortably supporting the population.

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