Explanation:
The St. Lawrence seaway helped because it was large enough to allow shipping transportation to the USA. Which allowed Canada and the USA to trade goods. The seaway extends from Montreal through the Welland Canal in Ontario, Canada, to the eastern portion of Lake Erie.
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What are the answer choices?
I think there are 4 types of middle clouds, but the only ones that share a prefix are altocumulus and altostratus, they both have the prefix alto which means high clouds