36. Ice tends to be less dense than liquid water. How does this characteristic of water help sustain life on earth?
A. Floating ice does not cause erosion and preserves coastal habitats.
B. Floating ice speeds the freezing process of water and protects the cryosphere.
c. Floating ice prevents the water underneath from freezing, allowing organisms to survive.
D. Floating ice keeps water colder than the atmosphere and keeps the water from evaporating,

they are known to reach a speed of 21 miles per hour

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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