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Biology 21 Online
OpenStudy (anonymous):

Which substance must be present for cellular respiration to take place? (Points : 1) carbon dioxide oxygen sodium sunlight

OpenStudy (anonymous):

wouldn't it be carbon dioxide?

OpenStudy (anonymous):

I think its oxygen... I'm not 100% sure though

OpenStudy (anonymous):

it's oxygen.

OpenStudy (anonymous):

ooh ok thanks

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