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Why did CO2 levels in the atmosphere decrease after 380 million years ago?
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Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?
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Chemistry, 22.06.2019 12:30
Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)
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Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.
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Chemistry, 23.06.2019 01:00
Iron (fe) reacts with copper sulfate (cuso4) to form iron (ii) sulfate. in this reaction, cu2+ gains electrons to form cu. which statement is true about this reaction? fe(s) + cuso4(aq) → feso4(aq) + cu(s)
Answers: 3
Why did CO2 levels in the atmosphere decrease after 380 million years ago?...
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