Why would these geographic features make sea trade more popular than trade on land

Eastern europe and parts of northern europe have which of the following climates?

By the triangle inequality theorem, if two sides of a triangle have lengths of 3 and 7, what are all the possible lengths of the third side? a) 3 < x < 8 b) 3 < x < 7 c) 4 < x < 10 d) 5 < x < 7

The us and canadian governments are doing all of the following to combat environmental problems except a. encouraging the use of public transportation b. enacting clean water policies c. requiring emissions testing d. limiting animal populations in some regions