The correct answer is: [C]:
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"T<span>he neuron releases chemical messengers (neurotransmitters) or electrical signals."
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In general Insulin receptors help by providing specific shape requirements for the glucose or sugary, so that it can produce insulin and release.
Just like the role in cells communication it gives roles and commands to specific order. In this case its like the insulin receptors.
Hope this helps! :)
D for #1 :)
The others are renewable
The answer is c I did this before on homework