Isotope analysis of Australopithecus teeth suggests that these hominins ate A) C₃ plants, probably including forest fruits and leaves. B) primarily C₄ plants, suggesting that most Australopithecus lived in open grassland. C) mostly C₃ plants early on, shifting to mostly C₄ plants over time. D) an even mixture of C₃ and C₄ plants, suggesting no change in diet for millions of years.

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Isotope analysis of Australopithecus teeth shows a shift from predominantly C3 plants (such as fruits and leaves found in forests) to predominantly C4 plants (such as grasses found in open savannas) over time, indicating a change in diet and environment.

Isotope Analysis of Australopithecus Teeth Suggests That These Hominins Ate