Which of the following is NOT something that the United States and Canada have in common? former English colonies

navigable waterways

have fertile farmlands

are constitutional monarchies

Afarmer who is grown corn for the past five years notices in the sixth year that the his harvest is significantly smaller, despite an increase in labor on the farm. the following year, the harvest continue to decline. which of the following explanations most plausibly accounts for the reduction in corn yield? a) soil degradation b) desalinization c) better irrigationd) terracing