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group of similar organisms that can breed with each other to produce fertile offspring. It is the lowest level (taxon) in the classification system.
tough cartilage that acts as a shock absorber between vertebrae and at the ends of bones in ball...
a species that helps scientists identify the age of sedimentary rocks.
the structural and functional unit of the kidney, which filters the blood and produces urine....
a non-membrane bound structure made of proteins and nucleic acids that occurs within the nucleus...