The structures of D-ribose and D-arabinose are shown below.These two molecules are ________. 
Definitions:
Market Segments
Distinct groups of consumers within a market who share similar needs, desires, and characteristics, allowing for targeted marketing strategies.
Behavioral Segmentation Variable
Criteria used in market segmentation based on patterns of consumer behavior, such as purchasing habits or brand interactions, to tailor marketing strategies.
Age
A measure of the length of time that a person has lived or a thing has existed, often used as a variable in demographics and market segmentation.
Psychographic Characteristics
Attributes relating to consumers' lifestyles, interests, attitudes, values, and personality traits, used in market segmentation to understand buying behaviors.
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