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Earth's atmosphere is composed of about 78 percent of what gas? a. carbon dioxide c. water vapor b. oxygen d. nitrogen select the best answer from the choices provided
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Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?
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Many humans consume both plants and animals. these humans are considered to be which of the following? herbivores carnivores omnivores
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The backbone of the double helix has an alternating molecules. what do you call these alternating molecule?
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Earth's atmosphere is composed of about 78 percent of what gas? a. carbon dioxide c. water vapor b....
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