Which factor does not contribute to environmental resistance?

• A. Birth Rate
• B. Limited resources
• C. Predation
• D. Disease

Answer: (A)

Environmental resistance is made up of factors that actively restrict population growth as it approaches the environment’s limits. Scarce resources, predators, and disease are classic examples of these constraints because they directly reduce survival or reproduction. Birth rate, on the other hand, is a measure of how rapidly the population could grow if conditions were ideal. It isn’t a constraint imposed by the environment itself, though a high birth rate can lead to stronger competition and thus stronger resistance later. So birth rate doesn’t contribute to environmental resistance in the same way that limited resources, predation, and disease do.