20. All of the following were staple foods of the Pacific Northwest Indian, except: A. pemmican B. camas root C. buffalo D. salmon

B. Camas roots

Explanation:

The camas roots are a type of food which are mainly prevalent in Western area of North America due to the nature of the climate suiting its optimal growth.

The Pemmican, Buffalo and Salmon were typical and stable foods eaten by the Pacific Northwest Indian people. This is due to the fact that the people were primarily known as hunter-gatherers which is why they had sources of meat as their meal.

your answer would be (b)