What are the steps involved in generating an action potential? What does it mean for an action potential to be all-or-nothing?

An action potential is caused by either threshold or suprathreshold stimuli upon a neuron. It consists of four phases; hypopolarization, depolarization, overshoot, and repolarization.

*Part 2 of the question*

An action potential occurs when a neuron sends information down an axon, away from the cell body. ... Therefore, the neuron either does not reach the threshold or a full action potential is fired - this is the "ALL OR NONE" principle.

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i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms