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.
Read more about neurotransmitter
<em>brainly.com/question/26387085</em>
The last step before the bill becomes law the signing of the bill by the president.
When the bill reaches the president, he has three choices namely:
1. he can sign and pass the bill
2. He can refuse to sign, or veto the bill, in which case the bill is returned to the house of representatives along with the president's reasons for thr veto.
3. Do nothing (pocket veto). In this case, if congress is in session, the bill automatically becomes law, but if it is not in progress, the bill does not become law.
Experiment.
It is a systematic process that carries out to make a finding or determine an identified fact, an inventive act or method. It is also authenticating a theory, offers perception into principle of causation by validating what conclusion arises when a specific aspect is handled
Answer:Ethnic origin refers to a person's 'roots'
Explanation: