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Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon
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Compare and contrast physical changes with chemical changes.
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15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.
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Relaciona os impactes da destruição de habitats com as ameaças à continuidade dos seres vivos...
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