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A. She wants the students to spend more time reading their books.
B. She did not have time to talk about the concept in depth.
C. She is going to read some important information to the students.
D. She wants the students to prepare for the next class.

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A. fossilized shellfish.
B. An animal skull.
C. A dead tree.
D. A giant crystal.

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A. Popcorn.
B. Radiometric dating.
Carbon-14.
D. Geological formations.

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A. The average time it takes for half of a group to decay.
B. Half the time it takes for a group to decay.
C. Half an hour for an individual nucleus to decay.
D. Half of the carbon present in a living organism.

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A. Because it was an example in the textbook.
Because he is using popcorn in a laboratory demonstration.
C. Because popcorn is a good analogy for half-lives.
D. Because popcorn is a carbon-based life form.

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A. She wants the students to spend more time reading their books. B. She did not have time to talk about the concept in depth. C. She is going to read some important information to the students. D. She wants the students to prepare for the next class.

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A. She wants the students to spend more time reading their books.
B. She did not have time to talk about the concept in depth.
C. She is going to read some important information to the students.
D. She wants the students to prepare for the next class.