Arizona State University (ASU) BIO 345 Evolution Exam 2 Practice

Resource availability is a crucial factor in biological evolution because it directly affects the survival and reproduction of organisms. When resources such as food, shelter, or mates are abundant, organisms can thrive and produce more offspring. However, when resources are limited, competition increases, and those individuals with advantageous traits—traits that enable them to utilize resources more efficiently or escape predation—are more likely to survive and reproduce. This selective pressure leads to natural selection, which shapes the evolutionary trajectory of the population over time.

Limited resources can highlight variations within a population; individuals that are better adapted to their environment will have a higher fitness and therefore a greater chance of passing on their genes to the next generation. This enforces the concept that evolutionary changes are not random but are rather directed by environmental pressures, such as resource availability. As a result, resource availability plays a fundamental role in shaping not only individual species but also entire ecosystems through driving natural selection on advantageous traits.