Which of the following molecules is not a straight-chain hydrocarbon? 
Definitions:
Gender Differences
Differences in male and female roles, behaviors, clothes, and so on that arise from society, not biology.
Phallic Stage
Freud’s third stage of development, when the penis becomes the focus of concern and pleasure.
Electra Complex
A psychoanalytic concept proposing a girl's psychosexual competition with her mother for possession of her father.
Learned Behavior
Behavior acquired through interaction with the environment and experiences, as opposed to being innate or instinctual.
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