The correct structure for ethyl 3-methylbutanoate is: 
Definitions:
Animal Development
The biological process by which animals grow and change over time, including physical and behavioral changes from birth through maturity.
Adaptive Problems
challenges faced by individuals or species that influence survival and reproduction, requiring evolutionary or immediate solutions.
Evolutionary Psychologists
Researchers who study psychological structures from a modern evolutionary perspective, aiming to understand the mind and behavior through the lens of adaptation and natural selection.
Reproduction
The biological process by which new individual organisms are produced from their parents.
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