Which material, principle, or process enables absolute (numerical) age dating?

a. cross-cutting
b. fossils
c. radioactivity
d. inclusions
e. superposition


Answer : c. radioactivity

Environmental & Atmospheric Sciences

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a. increased the spread of AIDS b. been a factor in the development of MRSA c. been favored by overuse of antibiotics d. two of these answers are correct e. all of these answers

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Regional differences causing diversity within the same language, such as 'soda' versus 'pop', are known as:

A) Creoles B) Dialects C) Jargons D) Vernaculars

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What is the distinction between marsupial and placental mammals? What will be an ideal response?

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Which of the following amino acids absorbs UV radiation at 280 nm?

A) phenylalanine B) tryptophan C) tyrosine D) all of these

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