ANSWER:
The resources available for the population have decreased would have caused the change.
Step-by-step explanation:
- The carrying capacity of a population is the maximum size of population that a species can sustain in the environment using the available factors.
- When the carrying capacity of a population decreases, it means that the resources for the species are not available in enough quantity to allow the population to sustain and thrive.
- Insufficient food, space, light and water are major causes for a decrease in the "carrying capacity" of a population.