High-altitude cirrus clouds are primarily formed from which substance? A.
ozone molecules
B.
nitrogen compounds
C.
carbon dioxide gas
D.
solid ice crystals

D. Solid Ice Crystals

Explanation:

"Cirrus clouds are wispy, curly, or stringy. They are found high in the atmosphere—typically higher than 6,000 meters (20,000 feet)—and are usually made of ice crystals." -National Geographic

answer; ///(b) it is composed of four protein chains and four heme groups;

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