What are some things the United States buys from Canada?

In the years following world war 1 , the red scare played a key role in the following political changes except

Which statement below accurately describes the carrying capacity of any ecosystem? a. it is not affected by any abiotic or biotic resources. b. it does not affect the species of an ecosystem. c. it is completely dependent upon the food supply. d. it is affected by both abiotic and biotic resources

The following force measurements were taken during actual testing of the lever pictured. what is the ama of this lever?