The usual mode of stimulus transfer in neuron- to -neuron interactions is CHEMICAL SIGNALLING. One cell interacts or communicates with another cell through cell signally where signal molecules such as hormones carry the information. Neurotransmitters are the chemicals that transfer the signals from one neurons to another.
Answer:
the number of electrons there are in its outer shell.
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Yes. that is how the medical community tests animals first for their response to the meds, then a clinical trial of humans take place..