Which layer of the atmosphere has the air we breathe? Mesosphere
Stratosphere
Thermosphere
Troposphere

Aneuron is stimulated with an electric pulse. the action potential is detected at a point 3.70 cm down the axon 0.0052 s later.when the action potential is detected 7.20 cm from the point of stimulation, the time required is 0.0063 s. what is the speed of the electric pulse along the axon? (why are two measurements needed instead of only one? )

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Select the word from the list that best fits the definition a system made of 25 satellites