Okay, I'm stumped guys. I looked everywhere online, can't figure it out. It's for my open university course so I don't have lots of sources to go to other than my book and online...doesn't help me.
The question is, in a suspension of Chlorella they're added heavy isotope of oxygen 18O2 and regular isotope of oxygen 16O2
[They show a chart of the heavy oxygen being in steady decline, while the regular oxygen increases during light and decreases during dark]
1) Why is there a decrease of heavy oxygen isotope concentration in both light and dark?
2) Why is there an increase in the regular oxygen isotope concentration in the light, and what is the source of of the isotope?
Please help, I'm totally flummoxed. :?
-nerdgirl