Which of the following is/are evidence of robust australopiths' adaptation to eating hard-shelled seeds and grasses?
A. the presence of very large molars and a sagittal crest on the top of the skull
B. fine finger bones and a large mandible
C. massive fossilized temporalis muscles
D. bipedalism, providing the mobility necessary to gather food in open grasslands
E. a small but flexible masseter muscle and an enlarged occipital bun
Answer: A
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