What does the signature of carbon-13:carbon-12 in the fossil record indicate about the history of hominin behavior?

Question

Quizplus · Accepted Answer

The signature of carbon-13:carbon-12 in the fossil record can reveal dietary shifts over time. A gradual shift in the carbon signature indicates a change in the types of plants consumed. In the case of hominins, this evidence suggests a transition from diets based on C3 plants (shrub-like plants) to those rich in C4 plants (grasses), reflecting adaptations to changing environments and available food sources.

What Does the Signature of Carbon-13:carbon-12 in the Fossil Record