ANSWER:
1. In what other way can we refer to CO2?
a. Chemical compound
b. Molecule
c. Substance
d. Gas
e. All the above
2. What does "Trend" mean?
a. Average
b. Deviation
c. Behavior
d. Tendency
e. Information
3. Are CO2 levels
a. Decreasing?
b. Increasing?
c. Staying the same?
d. Oscillating randomly?
e. Diminishing and then raising?