How does studying rocks and shells of aquatic organisms help scientists understand the history of Earth's climate?

Earth climate has a lot to do with weathering of rocks. When the temperature is high, there is more weathering of rocks, when the temperature is low, weathering of rocks is less.

Explanation:

Studying the rocks which is the field of Geology is done to study about the minerals, and other useful substances which tells a lot about the climate of the planet Earth.

The increase in the weathering of the rocks tells about the high temperature of the planet Earth. In the previous times, when there was less of carbon dioxide in the atmosphere, the temperature used to be low, there was less weathering of the rocks.

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 answer is c.) there is a warm front in region a and a stationary front in region b.