Which of the following best defines a species?

Study for the South Carolina General and Structural Pest Control 7A Test. Prepare with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

The best definition of a species is that it is a group of individuals capable of interbreeding. This definition is grounded in the biological species concept, which emphasizes the ability of individuals to reproduce and produce viable offspring. This reproductive isolation is a key characteristic that distinguishes one species from another, as it helps to maintain the integrity of the gene pool within a species and prevents blending with others.

In contrast, defining a species based on type of habitat does not take into account the biological and genetic relationships between organisms, as habitat preferences can vary widely within a single species. Classification based solely on physical characteristics can lead to misidentifications, as morphological traits may not always reflect genetic relationships. Moreover, a collection of non-interbreeding populations suggests a lack of connection necessary for a single species designation, as this definition would imply that the populations cannot reproduce with one another, which contradicts the concept of a cohesive species.

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