Which of the following factors influences demand? 
Definitions:
Monozygotic
Referring to twins that are genetically identical because they were formed from a single fertilized egg that split into two.
Chromosome
A thread-like structure made of protein and a single molecule of DNA, found in the nucleus of cells, carrying genes that determine inherited traits.
Genetic Action
The process by which genes influence traits or behaviors.
Hormone Levels
The concentrations of hormones present in the bloodstream, which regulate various bodily functions and can affect mood, growth, and metabolism.
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