1. Is inseparable from the carbon cycle and the water cycle.
The Oxygen Cycle
Is inseparable from the carbon cycle and the water cycle.
You will figure it out!
Then draw it.

2. Assignment # 77 In your Journal
Copy and answer the questions on the following 2 slides.
Using the information in the questions you answered, Draw the oxygen cycle. If it does not match the information in the answers of your questions you will not get credit.

3. Photosynthesis – look in your notes
How do plants get water?
Which part of photosynthesis produces O2 ?
What molecule is split giving it’s electrons to chlorophyll and becoming O2 ?
How does O2 leave the leaf?
How much of the atmosphere (air) is O2?

4. Aerobic Cellular Respiration
5. Where do aerobic organisms get their oxygen? 6. What part of Aerobic Cellular Respiration uses O2 ? 7. It (O2) accepts electrons and hydrogen ions to make what molecule? 8. That molecule can be released back into the environment by the excretory system.(Not a question) Go to #1