Bill Nye's My Kinda Guy

I woke up too late for class, so here is how I studied!

I learned about respiration:
http://www.youtube.com/watch?v=nkRcdfmHqqI

I learned about circulation:
http://www.youtube.com/watch?v=CRfrQXrLkDc

I learned about energy:
http://www.youtube.com/watch?v=QYyU6KZJ32k