Examlex
Briefly describe the distribution of one of the following groups in the U.S.: married couples, single adults, or single parents.Discuss some possible explanations for the regional variations in the family structure you selected.
Phospholipids
A class of lipids that are a major component of all cell membranes; they form bilayers that function as barriers to ions and molecules.
Macromolecule
Large molecules necessary for life, including proteins, nucleic acids, carbohydrates, and lipids.
Compound
A substance formed from two or more elements chemically united in fixed proportions.
Atom
The basic unit of a chemical element, consisting of a nucleus of protons and neutrons, and electrons orbiting the nucleus.
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