Answer :
Final answer:
The specimen 1470 (Homo habilis) unearthed in 1972 ignited a debate about the existence of multiple lineages within the Homo genus, due to its distinct characteristics, particularly its larger brain size.
Explanation:
The specimen that ignited the debate about multiple lineages within the genus Homo, discovered in 1972, is known as specimen 1470, officially known as Homo habilis. The specimen was unearthed in Kenya and its unique characteristics, mainly its large brain size compared to other Homo habilis fossils, raised questions about the number of hominin species that existed in the past. It brought about discussions on whether there existed multiple lineages of hominins simultaneously.
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