Giant fossil ferns have been found in canada. which conclusion can be drawn from this discovery?

Supporting us in the fact that fossil ferns have been found in Canada, we can conclude that: Canada once had a much warmer climate.

Explanation:

To understand this answer we need to analyze all the options.

1.- Canada once had a much warmer climate. This is correct because ferns only grow in environments with 73 and 86 Fahrenheit grades. Today Canada's temperature from 20 to almost 60 in general.

2.- Giant dragonflies once lived in Canada. Well, we can say that because we don't have information about dragonflies in our information. So it's incorrect.

3.- Canada was once covered by a giant sea. Well, we can't say that based on the information in the phrase. So it's incorrect.

4.- Dinosaurs once lived in Canada. The paragraph doesn't provide relevant information about dinosaurs, so it's incorrect.

chemical because it warmed up which involves temperature and it bubbled which includes changing

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