Which term describes a group of individuals of common ancestry capable of interbreeding?

The term that describes a group of individuals of common ancestry capable of interbreeding is "species." In biological classification, a species is defined as a group of organisms that can reproduce with one another in nature and produce fertile offspring. This reproductive isolation ensures that members of the same species share a genetic lineage and maintain unique characteristics that distinguish them from other species.

In contrast, the other choices refer to different concepts. "Solvent" and "solute" relate to chemistry, specifically the substances involved in a solution, while "spermatid" refers to a specific stage in the development of male gametes (sperm cells). Understanding that a species is fundamentally tied to both genetic continuity and the ability to produce viable offspring helps clarify why this term is the appropriate choice.