Detailed Explanation:

Answer: Option 2 — an early human species

Denisovans refer to an extinct species or subspecies of archaic humans that lived in Asia tens of thousands of years ago. They were first identified through DNA analysis of fossil remains found in the Denisova Cave in Siberia, making them a significant discovery in human evolutionary studies. Unlike other ancient human groups, Denisovans are known primarily through genetic evidence rather than complete skeletal fossils.

📝 Short Notes: Denisovans and Human Evolution

• Discovery: Denisovans were first identified in 2010 from a finger bone and teeth found in Denisova Cave in the Altai Mountains of Siberia.
• Classification: They are an extinct group of archaic humans closely related to Neanderthals, who diverged from modern humans around 500,000-600,000 years ago.
• Geographic Range: Evidence suggests Denisovans lived across a wide area of Asia, from Siberia to Southeast Asia and possibly the Pacific islands.
• Genetic Legacy: Modern humans, particularly Melanesians, Southeast Asians, and Aboriginal Australians, carry 3-5% Denisovan DNA, indicating interbreeding occurred.
• Physical Features: Limited fossil evidence suggests they had larger teeth and jaws than modern humans, adapted to harsh environments.
• Significance: Their discovery revealed that human evolution was more complex than previously thought, with multiple hominin species coexisting and interbreeding.