As a scientific concept, race Group of answer choices A. is very significant because it gives us a clearer understanding of human behavior than the concept of culture provides. B. is evidenced by the exclusive possession of particular types of genes. C. aids in explaining human diversity. D. is not very significant because it gives us little insight into human behavior. E. Both B and D

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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answer by yourhope:

hi! : )

in which structure in the nucleus are ribosomes made?

b) nucleolus!

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what are the options

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.