Energy flow within a system that contains life is necessary. scientists have explored this idea in projects such as biosphere 2 and conducted studies about the possibility of colonizing mars. how might research on the flow of matter and energy through ecosystems be to creating a colony on mars?

the answer would be d

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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the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus