Questions 13-15 refer to the following passage.

The author first mentions the half-life of carbon in order to

a. Provide a reason why carbon dating techniques fail to give an age for the habilis skull

b. Explain the success of carbon dating techniques

c. Illustrate the difference between carbon dating and other techniques

d. Show the need for extending carbon dating results with accelerator techniques

e. Illustrate the carbon equilibrium that all living things maintain

Transcribed Image Text:

The determination of the age of KNM-ER 1470, a humanoid skull, would add greatly to our knowledge of mammalian evolution. Anthropolo- Line gists originally dated the habilis skull at 3 million (5) years old. This age seemed unlikely because it was older than the age of any known aus- tralophithecines, which are presumed to be the habilis's ancestor. Further attempts to date the skull have led to speculative results.