Paige is 6 weeks pregnant. Although Paige drank alcohol before she became pregnant, she refuses to drink any alcohol now, because she does not want to have a baby born with .

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 fossil record provides evidence of a common ancestor to many species.

characteristics of hydrocarbons