Which of the following alkanes gives a significant fragment peak at m/z = 57? 
Definitions:
Brain Development
The process of growth and maturation of the brain, which includes changes in structure, function, and complexity over time.
External Stimuli
External forces or conditions that influence behavior, perception, or physiological responses.
Formal Operations
The final stage in Piaget's theory of cognitive development, marked by the ability to think abstractly and reason hypothetically.
Abstract Thinking
The cognitive ability to understand concepts that are not grounded in physical reality, and to use general principles to solve problems and generate new ideas.
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