Answer:
A. Organ.
Explanation:
Cells make up
tissues, tissues make up an organ. Organs make organ system
reactant gas is carbon dioxide and the product gas is oxygen.
Answer:
Yes it does.
And could you come help me with my latest question?
No. The trends go in different directions. CO2 goes up more than the volcanoes. It is the general trend that makes a difference compared to the fluctuations.
