Until modern times, most countries were ruled by

A king or queen, but sometimes it was by the highest ranked person if there was not a king or queen.

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!

D. a mountain abd are made by volcanos and tectonic plates