Questions 13-15 refer to the following passage.

Consider each of the following answer choices separately and select all that apply.

The author suggests that the burning of fossil fuels has had which of the following effects on the efficacy of carbon dating techniques?

a. It may increase the carbon-isotope mix of the object being dated.

b. It may make items subjected to carbon dating appear to have died later than is the case.

c. It may tilt the fragile equilibrium activity of living matter.

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.