Which term describes a group of organisms capable of interbreeding?

• A. Mutation
• B. Variation
• C. Species
• D. Evolution

Answer: (C)

A group of organisms that can interbreed to produce fertile offspring is described as a species. In biology this idea is captured by the Biological Species Concept, which defines species by reproductive compatibility and genetic exchange within the group, with barriers that prevent breeding with other groups. This makes the term the best fit for describing a distinct, interbreeding population boundary.

Mutation refers to changes in the DNA sequence, which can create new genetic variants. Variation describes the differences that exist among individuals within a population. Evolution is the process by which allele frequencies in a population change over generations. These terms relate to genetic change and diversity, not to the defining label for a reproductively cohesive group.