Answer:1 is that they modify Earth’s surface.
2 is that Both statements 1 and 2 are true.
3 is They cause small waves in the open ocean, but large ones near the shore.
4 is earthquakes: open up large cracks in Earth’s crust
tsunamis: erosion of beaches
Explanation:
Is there a picture that shows what 'e' is? Possible description?
Answer:
The sodium channel have refractory period.
Explanation:
Action potential are generated at axon hillock of neuron and travel across the neuron in response to stimuli. For the the generation of action potential the steps are stimulus, depolarization, repolarization, hyperpolarization and resting state.
So the first step for action potential after stimulus is depolarization. Depolarization requires the opening of sodium channels to make the inside of neuronal membrane positive. These sodium channels have refractory period. They cannot open immediately after activation. So the sodium channels of one direction in neuron (upstream) become refractory and it is convenent to open the sodium channels of other direction (downstream) of neuron. That why action potential is transmitted in one direction.
It is like the gunpowder placed at a line the fire cannot go back in burnt gun powder direction.