In class your professor shows you an MRI scan of a primate brain. The professor points out the relatively large size of the olfactory bulb beneath the frontal lobe. What does this suggest? A. This primate exhibits a derived trait for an enhanced sense of smell, since this trait is not commonly observed in mammal species.
B. This primate is a species of haplorrhine because it has an increased reliance on vision.
C. This primate must be a species of strepsirrhine, as that suborder of primates relies heavily on the sense of smell
D. The species of this primate must be nocturnal.

a.

2-1-2-3.

Explanation:

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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the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying