4. The grasses that cover the prairies in America are disappearing. The soil is good and there is enough rain. What is MOST LIKELY causing the grass to disappear? A) Too many hawks are eating snakes. B) The number of snakes has gone down. C) Too many grasshoppers are eating the grass. D) Too many earthworms are breaking down the soil.

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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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kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above