Why there is gap between day and night in frigid zone

the day-nigh lengths vary by season more tward the poles because the earth's rotational axis is at a tilt relative to the sun, the lengths of days and nights are different every day.

analyze the map below and answer the question that follows.

what does the map above tell us about the endemity of typhoid fever?

a.

there is greater occurrence of the disease in the western hemisphere.

b.

there is greater occurance of the disease in the northern hemisphere.

c.

countries located in equatorial regions are more likely to have incidents of typhoid fever.

d.

typhoid fever is more rampant among caucasian populations.