Multiple choice What is a species? A group of similar organisms whose members freely interbreed with one another All the organisms that live together in an area, including the physical environment Organism that live in the same area at the same time A group of similar organisms whose members cannot interbreed with one another Reveal answer Fill a bubble to check yourself A Correct answer Explanation A group of similar organisms whose members freely interbreed with one another is called a species. In biology, a species is one of the basic units of biological classification and a taxonomic rank.