Cycles

Out of these two videos you only need Carbon (0-1:20 and 5:16 to 10) and Nitrogen Cycles (0-5:18) for you homework tonight.  If you have questions that you want to discuss tonight you can post them as comments here, or send me a message on facebook or twitter (the real reason I have those accounts) or write them in your notes, and ask in class tomorrow.

Carbon from the first video ...

and Nitrogen from the second video ...