Seed Eaters Model of hominid differentiation. (Answer in 150 words)

- Seed Eaters Model of hominid differentiation. (Answer in 150 words)
Introduction
Clifford Jolly's seed-eaters model of 1970 derived the hominid line not from hunting or tools but from a shift to small hard objects on the open savanna.

Body
1. The claim: feeding on grass seeds, small hard fruits and rhizomes selects for a particular complex — reduced incisors and canines, enlarged flat-crowned molars with thick enamel, a deep buttressed mandible, powerful chewing muscles, a shortened face, and a precision grip for picking small items. Prolonged sitting while feeding gives an upright trunk.
2. The evidence and the analogy: the model is built on Theropithecus gelada, the graminivorous baboon of the Ethiopian highlands, which shows that same dental and manual complex without any hominid ancestry. The australopith dentition, above all in Paranthropus, matches the prediction.
3. The criticisms: convergence with a monkey does not establish the cause. Bipedalism appears in Ardipithecus and Orrorin well before megadonty, and isotopes show Paranthropus boisei eating C4 grasses and sedges rather than hard seeds.

Conclusion
As a general account of hominid origins it is superseded; as an explanation of the robust australopith chewing apparatus it remains standard.