Answer:
A black hole
Explanation:
A black hole is very dark. And it's also an opening.
The Daily Value for sodium is less than 2,300 milligrams (mg) per day
The answer to this question would be: <span>B. Receptor site
The receptor site of a neurotransmitter often only receives a specific kind of transmitter. That was because the receptor has a unique 3D structure, so different transmitter wouldn't fit into the receptor. That was similar to lock and key principles.</span>
The mRNA brings the message that was transcribed by the DNA to the ribosome, while the tRNA brings the anticodon to translate the message.
