Final answer:
British Columbia's economic strength flows from its resource sector, its knowledge-based economy, fishing, and tourism.
Step-by-step explanation:
The primary industries that contribute to British Columbia's economic strength, in addition to its resource sector and knowledge-based economy, include fishing and tourism.
In the Maritime Provinces of the east, fishing and agriculture are the main economic activities. However, due to overfishing in the North Atlantic, the fishing economy has declined.
Tourism is also a significant source of revenue in places like Prince Edward Island, where it is the dominant economic activity.