Final answer:
Olduvai Hominid No. 7 (OH7), the type specimen for Homo habilis, discovered at Olduvai Gorge, is approximately 1.8 million years old. This specimen is pivotal in the study of human evolution, showing distinct characteristics like smaller teeth and a brain structure that indicates speech capability.
Step-by-step explanation:
The specimen known as Olduvai Hominid No. 7, or OH7, is of significant importance in the field of paleoanthropology. Discovered by Jonathan and Mary Leakey at the Olduvai Gorge in 1960, OH7 is the type specimen for Homo habilis, described by Louis Leakey in 1964. Its discovery was pivotal in understanding early human evolution. Based on stratigraphic analysis and relative dating, the type specimen OH7 has been estimated to be approximately 1.8 million years old.
OH7, which includes a partial juvenile skull, hand, and foot bones, showcased distinct characteristics that set it apart from the older australopithecines. Its smaller teeth and evidence of a possible Broca's area on an endocranial cast allude to its place in the transition towards more advanced hominins. Homo habilis is considered an early member of our own genus Homo, introducing the use of stone tools and larger brain size compared to its australopith predecessors.
Hence, the answer to the question concerning the age of OH7 is: A) Approximately 1.8 million years old.