A special spring is constructed in which the restoring force.

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if you could turn it upside down it would say b o o b i e

we have to select the terms that are associated with communication between neurons.

synapse is the gap between two neurons that is there to transmit the signal.

from one neuron to other neuron the signals transmit through neurotransmitter which is a chemical and finally after reaching it becomes the electrical signal

therefore, option 4th is correct that is: synapse,electrical signals and neurotransmitter.

answer; i believe that the correct answer is loud noise;