Which of the following is not another representation for 2-methylbutane? 
Definitions:
Existing Schemes
Cognitive structures or patterns of action and thought used to deal with experiences, according to Piaget's theory of cognitive development.
Sex Drive
A biological and emotional urge for sexual activity.
Psychodynamic Perspective
A psychological framework that views human behavior as the result of interacting forces and drives within the person, often unconscious, shaped by childhood experiences.
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