Carrying capacity is best described as

• A. The population grows without limits
• B. The rate at which individuals are born
• C. The maximum sustainable yield per year
• D. The largest population that an environment can support at any given time

Answer: (D)

Carrying capacity is the largest population size an environment can sustain over the long term given the resources available (food, water, habitat, space) and other limiting factors. It arises from the balance between births and deaths and the influence of density-dependent factors like competition and disease. When a population nears this limit, resources become scarce, growth slows, and the population tends to stabilize; if it pushes beyond, resource depletion can cause a sharp decline. It isn’t about a birth rate, nor about unlimited growth, and it isn’t the maximum sustainable yield per year, which refers to how much can be harvested annually without reducing the population. The best description is the largest population that the environment can support at a given time.