Which of these molecular structures could be found in a lipid, but not in a carbohydrate, protein, or nucleic acid? A. a long chain of carbon, oxygen, and nitrogen atoms B. a long chain made only of carbon and hydrogen atoms C. a phosphate group joined to a chain of carbon atoms D. an amino group and a carboxyl group bonded together

a long chain made only of carbon and hydrogen atoms

Explanation:

Lipids are made of very long carbon chains connected to other carbons and hydrogen. These chairs can be connected to another molecule such as glycerol.

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all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

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bioteacher101