Final answer:
Specimen 2700's cranial capacity is related to the study of human ancestors and their brain size. Homo antecessor had around 1,000 cc, Homo ergaster averaged 1,100 cc, and Homo heidelbergensis averaged 1,200 to 1,400 cc, while the earlier Sahelanthropus tchadensis had only 350 cc.
Step-by-step explanation:
The student's question about Specimen 2700's cranial capacity pertains to the study of human ancestors and their anatomical features. Different members of the genus Homo had different cranial capacities which give us insights into their brain size compared to modern humans. For instance, Homo antecessor had a cranial capacity of about 1,000 cc, while Homo ergaster averaged about 1,100 cc. It is important to note that modern humans have an average cranial capacity of about 1,400 cc. When comparing these figures, it is evident that archaic humans had smaller brain sizes than modern Homo sapiens, but there is a clear progression in size throughout the evolutionary timeline. For example, other Homo species like Homo heidelbergensis had a cranial capacity averaging 1,200 cc to 1,400 cc, and the Sahelanthropus tchadensis, an early potential ancestor, had a cranial capacity of only 350 cc.