Researchers are studying lichens growing on trees in a forest
ecosystem. At the beginning of the study, the researchers
identified 12 lichen species in the forest. Later, a forest fire
happened in the study area. The researchers returned to the
area and found only 6 lichen species.
A. Most lichen species are unaffected by the forest fire.
B. Certain lichen species are better adapted to survive forest fires
than others.
C. The biodiversity in the forest increases after a fire.
D. Forest fires will always permanently remove the same species from
the ecosystem.

Please help!!!

The answer is A. Most lichen species are unaffected by the forest fire

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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thinking it would be d not too sure but i think it's right