During an action potential, a neuron's membrane potential
A. decreases as sodium ions flow into the neuron.
B. increases until it reaches threshold, then decreases.
C. may or may not reach threshold.
D. increases until it reaches threshold, then spikes.
Answer: D
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One of the reasons why tornado frequency is lower in Europe than in North America is
A) the Gulf Stream encourages the clash or warm and cold air. B) east west trending mountains inhibit the clash of warm and cold air. C) lower population densities and storm reporting capabilities. D) higher than normal temperatures due to the presence of the Gulf Stream.
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What does a food web illustrate?
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