Which of These Is Most Likely to Be Used to Directly

question 23

Multiple Choice

Which of these is most likely to be used to directly date the age of a fossil?

• A) carbon-12
• B) uranium-238
• C) lead-206
• D) carbon-14
• E) thorium-234

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Definitions:

Positron Emission Tomography

A type of medical imaging technique that uses radioactive substances to visualize and measure changes in metabolic processes and other physiological activities in the body.

Metabolism

The set of life-sustaining chemical transformations within the cells of living organisms that allows them to grow, reproduce, maintain their structures, and respond to their environments.

Isotopes

Variants of a chemical element that have the same number of protons but different numbers of neutrons in their atomic nuclei, resulting in different atomic masses.

Social Engineering

Any technique that uses social skills to generate human interaction for the purpose of enticing individuals to reveal sensitive information.