Question

Difficulty: Very hardInferences and Implicit Meaning

In mid-twentieth-century paleoanthropology, the discovery of taphonomically altered faunal assemblies alongside *Australopithecus africanus* fossils led Raymond Dart to formulate the 'osteodontokeratic' culture hypothesis—positing that early hominins systematically crafted weapons from bone, tooth, and horn. Dart interpreted fractured baboon crania at Makapansgat as definitive evidence of predatory violence and deliberate clubbing executed by *A. africanus*. However, subsequent taphonomic reassessments initiated by C. K. Brain demonstrated that these characteristic fracture patterns were almost entirely attributable to the predatory mechanics of leopards (*Panthera pardus*) and passive geological compaction within cave shafts. Brain’s meticulous counts of skeletal element representation revealed that the disproportionate survival of durable bones—such as mandibles and distal humeri—reflected differential preservation dynamics rather than selective tool curation by hominins. While Brain successfully dismantled the premise that *A. africanus* was a bloodthirsty apex hunter, some modern researchers argue that his total attribution of bone accumulations to non-hominin agents overlooked subtle cut-marks and fracture morphologies present on a minor subset of the Makapansgat fauna, which indicate opportunistic scavenging of carnivore kills by early hominins.

Based on the passage, which of the following can be validly inferred regarding C. K. Brain’s analysis of the Makapansgat fossil deposits?

  1. It relied on evaluating the relative survival rates of specific anatomical structures to challenge the assumption of intentional hominin tool selection.Answer
  2. B
    It definitively established that early hominins engaged in no physical interactions with large carnivores in their local environment.
  3. C
    It concluded that fractured baboon skulls were produced primarily through hominin weapon usage rather than natural predatory processes.
  4. D
    It demonstrated that taphonomic methodology is fundamentally incapable of differentiating between carnivore damage and early hominin scavenging.
  5. E
    It completely disproved Dart’s work by demonstrating that hominins never entered or inhabited the cave systems where fossils were found.

Answer

Brain's taphonomic assessment relied on evaluating the relative survival rates of specific anatomical structures to challenge the assumption of intentional hominin tool selection.
The correct option accurately synthesizes passage detail regarding Brain's work. The text notes that Brain's 'counts of skeletal element representation revealed that the disproportionate survival of durable bones... reflected differential preservation dynamics rather than selective tool curation by hominins.' This directly validates the inference that his analysis evaluated differential survival rates of anatomical parts to counter the tool-curation hypothesis.

Step-by-Step Solution

1
Analyze the passage text concerning C. K. Brain's methodology and findings.
Brain performed counts of skeletal element representation and observed that durable bones (like mandibles and distal humeri) survived disproportionately.
Understanding Brain's specific empirical method is essential to inferring what his analysis relied upon.
2
Connect Brain's empirical findings to his central conclusion.
Brain concluded that bone presence was driven by differential preservation dynamics rather than selective tool curation by hominins.
This directly supports the inference that bone survival rates were used to refute the hominin tool selection hypothesis.
3
Evaluate the option choices against passage evidence and eliminate invalid extrapolations.
The statement about evaluating relative survival rates of anatomical structures accurately reflects Brain's methodology without overstepping passage facts.
Valid GRE reading comprehension inferences must be strictly supported by explicit text statements.

Key Concept

Drawing Valid Inferences from Academic Reading Passages
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