Question 21.
Frank packs and weighs his school backpack. The backpack weighs
3 pounds. Then Frank puts in a textbook that weighs 25 pounds and
removes a notebook that weighs 8 ounces. Which expression can be used
to find the weight of the backpack now in ounces? (1 pound = 16 ounces)
A 48 + 32-8 C 60 + 32 - 8
B 48 + 40 - 8
D60 + 40 - 8

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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bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )

you have the answer? i really need it