Which of the following factors influences demand? 
Definitions:
Environmental Factors
Elements within the external surroundings that can influence the development, behavior, or survival of organisms or systems.
Psychological Disorder
A condition characterized by abnormal thoughts, feelings, or behaviors that cause distress or impairment in personal, social, or occupational functioning.
Identical Twins
Twins who develop from a single fertilized egg, sharing the same genetic material.
Polygenic
Referring to a trait that is influenced by multiple genes, often resulting in a continuous range of possible phenotypes.
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