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Organisms need nerve cells to respond to the environment. Plants respond to the environment through reactions to and the production of chemicals. Animals often have to react more quickly to the environment to avoid danger, capture food, secure a mate etc.

Nerve cells in humans allow us to think (the brain), see, avoid pain and danger. There is a rare disorder where people do not feel pain. This is very dangerous as the can break a limb or bleed without knowing they are injured.

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15y ago

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