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John was called by a market researcher and asked a few questions about his television viewing habits.The researcher then asked him to go to a Web site to complete a more comprehensive survey.This type of study that employs a combination of survey methods is called a:
Steroids
A class of lipid molecules that includes hormones, vitamins, and cholesterol, which serve various functions in organisms.
Phospholipids
A class of lipids that are a major component of all cell membranes, containing two fatty acids, a phosphate group, and a glycerol molecule.
Polymer
Macromolecule consisting of covalently bonded monomers; for example, a polypeptide is a polymer of monomers called amino acids.
Monomers
Small molecules that can join together to form polymers, serving as the building blocks for various macromolecules.
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