Answer this question using the image below and your current knowledge.

See explanation.

Explanation:

With my current knowledge, this looks like erosion due to a combination of run off, acid rain, and sediment being carried in wind. It has happened over the course of millions of years, and will continue to happen for millions of years to come.

The atmosphere makes this acid rain precipitate and run off as well as makes the winds that erode at the rock.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

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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