Which gases contribute to the greenhouse effect?
A. nitrogen and helium
B. carbon dioxi...
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Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems
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What element does susan b. anthony include in this passage to strengthen her argument?
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The smallest parts of these that retain their original properties are called
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