Which practice is specifically used to increase desirable traits in a species?

The practice specifically used to increase desirable traits in a species is artificial selection. This method involves humans selecting which individuals of a species will reproduce based on certain traits they want to amplify in future generations. For instance, by choosing plants or animals that exhibit favorable characteristics—such as higher yield in crops or specific traits in livestock—artificial selection allows for a targeted approach to influence genetic outcomes over time, effectively enhancing traits that are beneficial or desirable.

In contrast, interbreeding refers to breeding within a closely related group and may not necessarily aim at enhancing specific traits. Eugenics, historically associated with controversial and unethical practices to improve the genetic quality of human populations, does not fit the context of increasing desirable traits in a species in a responsible or scientifically accepted manner. Hybridization involves crossing two different species or varieties to create a hybrid, which may lead to desirable traits but isn't as controlled or focused as artificial selection, where the selection of traits is intentional and systematic.