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kaplan said UV can't fix Nitrogen whereas cliffs said UV fix N2.
which is true?
what about volcano? I think I've read that volcano also fix N2 ..
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so QR has gotten harder...
comparing to kaplan QR, setting kaplan as 5 in scale of 10, how woud you rate it?
which is true?
what about volcano? I think I've read that volcano also fix N2 ..
----------------------------------
so QR has gotten harder...
comparing to kaplan QR, setting kaplan as 5 in scale of 10, how woud you rate it?