The carbon that plants need for photosynthesis comes from (carbon dioxide gas in the atmosphere)
D - an increase in tree cover in the tundra.
I will go outside after i make my airplane. I will through it at about a 45 degree angle and see if my hypothesis was right about how far it will go. Then I will right down my results.
hope this helped
Answer:
The less supply, the more demand, and vice versa.
Explanation:
It also depends on how valuable the resource is.
