Sodium ions are outside, while potassium ions are inside the neuron.
Answer:
the virus undergoes genetic changes
The living organisms that inhabit that environment would adapt to a more humid environment, and be know what to expect from it.
Adaptation is when a organism adapts to a certain environment in order to live more comfortable adn better equiped for it.
Answer:

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Coordinate communications with the body, regulate the body's response to pain, control skeletal muscle contractions