Carrying capacity is defined as

• A. the average lifespan of individuals
• B. the total number of species in a region
• C. the largest population that an environment can support at any given time
• D. the rate at which individuals are born

Answer: (C)

Carrying capacity is the maximum number of individuals of a given species that an environment can support sustainably at a given time, considering available resources like food, water, space, and the effects of predators, disease, and competition. This limit can shift with changes in resource availability, habitat conditions, and management actions such as habitat restoration or protection. Understanding this helps managers avoid overuse of habitat and set appropriate harvest or conservation goals to keep populations in balance with their environment. The other ideas don’t fit because carrying capacity isn’t about how long individuals live, nor about how many species are present, and it isn’t simply the birth rate—birth rate influences population size, but the sustainable upper limit depends on resource availability and ecological factors.