. When the difference between the wet-bulb temperature and dry-bulb temperature is the relative humidity is
1) 0%
2) 25%
3) 50%
4) 100%

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!