In the savanna ecosystem, grass is eaten by gazelles, zebras, and cape buffalo. The gazelles and zebras are eaten by hyenas while the lions eat gazelles, zebras, and the cape buffalo. If there was a decrease in the number of zebras due to a disease outbreak, which statement best
describes how the food web might be impacted and why?
O A. The gazelle population could decrease because the hyenas would eat more gazelles.
B. The zebra population could increase because there would be more lions.
OC. The grass population could decrease due to more herbivores feeding,
D. The cape buffalo population could increase because there would be fewer carnivores.

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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i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

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