The issue of whether human activities cause global climate change is a controversial topic. which limitation to climate research could most likely be overcome through scientific design?

conditions that create climate are extremely complex.

data from a wide range of time periods must be analyzed.

conducting experiments on a global scale is extremely expensive.

altering climates has ethical considerations because of the potential for harm.

Option B, Data from a wide range of time periods must be analyzed.

Explanation:

The climate change is studied by the climatologists in relevance to the climatic conditions in the past.  

The climate change will remain stable if no external agent is interfering with natural processes, but since the evolution of mankind (billions of years back) it has become essential for scientist to study the climatic condition in those ages or ages much before that in order to work out how human interventions are disrupting the natural phenomenon.

In order to do so, it is very important to predict the actual climatic condition billions or millions of year back . Hence, through scientific design , researchers must try to overcome the limitation of data assessment from wide range of time periods.

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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c

explanation: