4. What are two ways that celestial navigation/astronavigation and navigation by GPS differ? Do they have anything in common?

Differences: Celestial navigation is completely based on the position of sun in the sky. Here, the use of angular measurements can exist among the celestial objects. It is less accurate than the GPS.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this