Which of these allows the trial judge to be the “gatekeeper” or final decision-maker on admissibility of evidence or acceptance of a witness as an expert in their courtrooms? a) rule 702 b) frye standard c) daubert ruling d) locard’s exchange principal

The answer is Daubert Standard or Ruling. This ruling makes available a rule of evidence concerning the admissibility of expert witnesses' testimony throughout United States federal legal measures. Pursuant to this ruling, a party may raise a Daubert motion, which is a extraordinary case of motion in limine upturned earlier or for the duration of the trial to eliminate the demonstration of unreserved indication to the jury. 

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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oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%