What defines a macromolecule as a lipid?
A. All lipids are insoluable in water.
B. All lipids have the element nitrogen.
C. All lipids are solid fats.
D. All lipids carry genetic information

A. All lipids are insoluble in water.

Explanation:

Macro molecules are also called polymers, which are formed as a result of polymerization of molecules such as carbon, hydrogen and oxygen.

There are four types of  macro molecules in the mammalian system which are

Lipids are macro molecules that do not dissolve in water i.e. they are hydrophobic. they help in the formation of cell membranes and hormones in the body.

c

explanation:

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