Why were beavers important to indigenous peoples of Canada?

The trade in beaver pelts had been the centre of Canada's economy from the early 17th century to the early 19th century. Based on the history, the beaver is the national symbol of Canada.

Explanation:

changeable lenses of different focal lengths allow light to enter the camera, which then forms the image on light-sensitive film" is the one among the following statements about working principle behind a basic still camera is true.