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Photosynthesis is ___________ reaction, because it needs sunlight to proceed. A. an exothermic B. an electric C. an endothermic D. a combustion

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Which of the following takes place during a single displacement reaction? A. a complex substance breaks down into two or more simple substances B. a single substance replaces another substance in a compound C. two simple substances combine to form a new complex substance D. parts of compounds switch places to form two new compounds ?

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Other answers:

For sure C
for the first question
like a simple substance like NaCl +Mg2+=Mg(Cl)2 +Na+ this is a single displacement i would say B for the second one

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