A. review what are the two primary sources of energy that power living systems? b. pose questions propose a question that a scientist might ask about the variety of organisms found around deep-sea vents. 7.a. review explain how consumers obtain energy. b. compare and contrast how are detritivores different from decomposers? provide an example of each. 8.the word autotroph comes from the greek words autos, meaning "self," and trophe, meaning "food or nourishment." knowing this, what do you think the greek word heteros, as in heterotroph, means?

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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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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