Which of the graphs below have Euler circuits? 
Definitions:
3-Week-Old Infant
An extremely young baby who is in the early stages of development, characterized by rapid growth and changes.
Tongue
A muscular organ in the mouth of most vertebrates that manipulates food for chewing and swallowing and is also used for taste and phonetic articulation.
Concrete Operational
A stage in Piaget's theory of cognitive development, typically occurring between ages 7 and 12, where children develop logical thinking but still struggle with abstract concepts.
Odd Number
An integer that is not divisible by 2, characterized by having a remainder of 1 when divided by 2.
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