Answer: Organelle
Explanation: A nucleus is an organelle that functions as the cell's brain, regulating its production of proteins and genetic material. The nucleus governs the cell's production of these substances by means of its deoxyribonucleic acid or DNA. ... It contains information that determines the cell's purpose and function.
It is important cause it helps you understand the behavior of the why these goals need to be achieved
Definitely your immune system
Answer: <u><em>after stimulating a nerve fiber, slight leakage of sodium ions to the interior of the nerve fiber occurs through sodium channels in the nerve membrane. those entering sodium ions change membrane potential, causing more opening of channels. more change of potential, still more opening of channels, and so forth.</em></u>
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<em>HOPE IT HELPS!</em></h2>
