Please help, asap! tysm.

Ships can transit between the atlantic and pacific oceans using the canal.

Which continents lie only in the northern hemisphere

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.