How many structural isomers are shown here? 
Definitions:
Concrete Operations
A stage in Jean Piaget's theory of cognitive development typically occurring between ages 7 and 11, where children develop logical thinking but still struggle with abstract concepts.
Digit Span Performance
A cognitive test that measures short-term memory capacity by having individuals recall sequences of numbers.
Cross-Cultural Research
The study of similarities and differences among people from different cultural backgrounds, often to understand human behavior and social norms.
Gumball Machine
A vending machine that dispenses gumballs when a coin is inserted and the mechanism is operated.
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