Question

The boys end up being adopted by different families. Tom, the brother who lives in the large city is diagnosed with attention deficit hyperactivity disorder (ADHD). Tests were done and it was discovered that the level of _____in his blood was twice the levels found in the general population. The doctors are convinced this is the cause of his disorder.
a. amino acids
b. glucose
c. mercury
d. neurotransmitters

Answer

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