How can you know whether it's safe to dive into a lake or a river?
a. observe the color of th...
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If the singular term ends in -us, the plural is usually formed by changing the ending to
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During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4
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Which of the following is a way to prevent poisoning? a. avoid the overuse of bleach and disinfectant. b. keep carbon monoxide detectors away from the kitchen. c. follow medicine prescriptions properly. d.
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