Both algae and the fungus are benefited from their relationship in a lichen. this relationship is one of commensalism parasitism predator-prey mutualism

Mutualism because they both benefited

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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dude i stopped reading after the first 7 words but hey you seem real smart thats awesome have a great day