In biology lab, your instructor informs you that carbon-14 dating will demonstrate the use of determining the age of a fossil. Using only this information, you estimate that the age of the fossil must be less than about years old.

A. 75,000
B. 1.3 billion
C. 40,000
D. 100,000
E. 300,000


C. 40,000

Biology & Microbiology

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In humans, skin color is controlled by several genes. Thus, skin color is a(n) ____ characteristic.

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The methanogenic archaeans belong are ____

a. aerobes b. facultative anaerobes c. strict aerobes d. facultative anaerobes e. strict anaerobes

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