Is the primary source of drinking water for the vast majority people on earth

Yeah because I checked the Internet to double check

2cool and cold temperature unless its an ever green tree 

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!