what do the flasks contain?

<em>The next time you wake in the middle of the night and need to make a trip to the kitchen or the restroom, cover one of your eyes with your hand before turning on any lights. You'll save the night vision (a.k.a. Sharingan) in that eye. The effect is trippy.</em>
Answer:
glucose
Explanation:
If you mean cellular respiration, it is glucose.
I would say that it would be C, Relationships of trees to other organisms in the rain forest...
Answer: The answer would be Substrates