Which of the following is an example of a natural source of air pollution? a. mining releases gases trapped beneath earth's surface. b. burning coal and natural gas releases carbon dioxide. c. erupting volcanoes release many toxic gases. d. plowing and harvesting crops releases dust particles.
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The response is the basis for vaccination. primary secondary tertiary none of the above
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Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time
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Blood stem cells may develop into any kind of human blood cells. what kind of stem cells are blood stem cells? a. multipotent stem cells o b. totipotent stem cells o c. pluripotent stem cells o d. unipotent stem cells
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What happens when water’s salinity increases? mass decreases. freezing point decreases. buoyancy of objects decreases. the amount of dissolved minerals decreases.
Answers: 2
Which of the following is an example of a natural source of air pollution? a. mining releases gases...
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