Any distinct change in the climate that lasts for a long period of time is known as: a. acid rain b. ozone depletion c. climate change d. greenhouse gases

Ithink that the missing word is mixed

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!