I carry signals from one place to another, yet I am not a voice. My structure is key, and I can be simple or complex. What am I?

Category: Science · Difficulty: hard

Hint: I play a significant role in communication within the brain.

Answer

Neurotransmitter

Explanation

Neurotransmitters are chemicals that transmit messages across synapses in the nervous system, crucial for communication in the body.

This is a hard science riddle — a tricky one that takes a little thought. The answer is Neurotransmitter.

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