The accompanying figure best represents what happens at a(n) _.
(Will be marked as Brainliest NO JOKE)
a. neuronal membrane
b. muscle fiber
c. negative feedback loop
d. neuromuscular junction
e. postsynaptic terminal

Option D: Neuromuscular junction

Explanation:

This is the site of transmission of chemical signal also known as a chemical synapse between a neuron and a muscle fibre. Most of the time the chemical released which is a neurotransmitter is acetylcholine. When released, it stimulates the release of calcuim ions present in the sarcoplasm: an endoplasm like structure in the muscle fiber that contains calcium ions.

the index of refraction of the second medium is higher. i just took the test trust me !

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.