the Kingdom is the highest rank in classification. It is subdivided into 5 major kingdoms while as species is the basic unit of classification. A species can be defined as a group of interbreeding organisms that are capable of producing fertile offspring
A kingdom is a broad classification that includes many organisms sharing few similarities, whereas a species is a specific classification of organisms that can interbreed and produce fertile offspring. Kingdoms represent major divisions of life, while species represent a more precise grouping. The two concepts illustrate the hierarchical nature of biological classification, from broad to specific.
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