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In biology, a species is a fundamental classification unit that includes organisms sharing common characteristics and the ability to interbreed naturally. This concept, known as the biological species concept, is widely accepted and used in various fields of study.

• According to this concept, individuals within a species can mate and produce viable offspring, while being reproductively isolated from other species. This reproductive compatibility is a key characteristic that sets different species apart.
• However, there are more than 20 other different species concepts, each focusing on different aspects of what defines a species. 
• For example, the ecological species concept defines a species based on the specific resources and ecological niche they occupy. It focuses on how organisms interact with their environment.
• Additionally, species can also be defined based on their shared evolutionary history. This approach, known as phylogenetics, studies the evolutionary relationships among organisms. Species that share a recent common ancestor are grouped together.
• These different species concepts show the diversity and complexity of life on Earth. Each concept provides a unique view of what defines a species.