Base your answers to questions 14 through 18 on the topographic map below which shows elevations in feet. There is a railroad track with a bridge shown on the map.
Pipeon River
Кеу
Bridge
HH Railroad
1 Hachured line
Triangulation
point
Bence
14. What is the contour interval of the map?
15. Which stream has the greater velocity, Pigeon River or Daly Creek? How can you tell?
16. How many miles of railroad appear on the map?
17. How far above Daly Creek is the railroad bridge at AB?
18. What is the elevation at the edge of the depression?

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.  

read more on -

i think its white blood cells

i hope this

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added