On August 1, 2000 North Carolina enacted a permanent rule to protect and maintain riparian zones, including the Neuse River system. The rule focuses on a variety of water pollution issues that include all BUT

there are oil pollution radio active waste  urban devolpement and plastics

Explanation:

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

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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