If carrots were removed from the food web, how might the other populations be affected? There might be more rabbits and foxes.
There might be more grass but fewer owls.
There might be fewer rabbits and foxes.
The rabbits might start eating mice.

there might be fewer rabbits and foxes

Explanation:

If carrots were removed from the food web then there might be fewer rabbits and foxes. This is because based on this web, carrots make up 50% of the rabbit's diet. If this is removed, then there would not be enough food to maintain the same size population and the population will begin to shrink. This also applies to the fox population since their main source of food are the rabbits. If the rabbit population decreases, then the fox population will decrease as well since their food supply has shrunk and will not be able to maintain the current fox population size.

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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for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.