Air is predominantly composed of:
a. O2, CO2, and CH4
b. O2, N2, and CO2
c. O2 and N2
d. O2, CO2, and H2
e. O2 and CO2.
Answer: C
Air is predominantly composed of:
a. O2, CO2, and CH4
b. O2, N2, and CO2
c. O2 and N2
d. O2, CO2, and H2
e. O2 and CO2.