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How is a species defined in biological terms?

  1. A group of organisms that can evolve

  2. A group of organisms that can successfully interbreed

  3. A group of organisms with similar traits

  4. A group of organisms within the same habitat

The correct answer is: A group of organisms that can successfully interbreed

In biological terms, a species is defined as a group of organisms that can successfully interbreed and produce fertile offspring. This definition, known as the biological species concept, highlights a key aspect of species: the ability to share genetic material and produce viable progeny within the group while being reproductively isolated from other groups. This concept emphasizes reproductive compatibility as a defining factor for a species, which is crucial for maintaining the genetic integrity of populations over time. While organisms sharing similar traits or living in the same habitat can indicate common ancestry or ecological relationships, these characteristics do not fully capture what delineates a species. The emphasis on successful interbreeding encompasses genetic continuity and the evolutionary dynamics of populations, making it a foundational aspect of how species are understood in biology.