<span>The most unpredictable presentation aid a speaker could use is a person or an animal.
Presentation aids are things other than the expressions of a speech that are utilized to support the goal of the speaker. Specifically, they can be visual aids, sound aids or other supporting innovation.</span><span /><span>
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2 years ago

Which letter represents a neurotransmitter acting via direct effects?.

leonid [27]

The letter A is the one that represents a neurotransmitter acting via direct effects.

<h3>What is a neurotransmitter?</h3>

These are chemical messenger that helps carries signals across the neurons and target cells throughout the body.

Hence, the letter A represents a neurotransmitter acting via direct effects because its involves direct connection between the neurons.

Therefore, the Option A is correct.