Examlex
Which of the following is most closely related to the lobe-finned fishes?
Nicotine
A stimulant drug found in tobacco products, which is highly addictive and affects the nervous system.
GABA
A neurotransmitter in the brain that inhibits nerve transmission, playing a key role in regulating neuronal excitability and anxiety.
Acetylcholine
A neurotransmitter in the brain and nervous system important for muscle function, memory, and cognition.
Antagonist
An antagonist is a character or force in literature or drama that opposes the protagonist or main character, often creating conflict.
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