The term for the natural process of selecting organisms for desirable traits is "natural selection." This evolutionary mechanism, first described by Charles Darwin, involves the survival and reproduction of individuals best suited to their environment. Organisms that possess advantageous traits have a higher chance of surviving and reproducing, allowing these traits to be passed on to succeeding generations. Over time, this process can lead to adaptations within a species and contribute to the evolution of new species. Natural selection plays a crucial role in shaping biodiversity and the dynamics of ecosystems.