What is the purpose of the locks?

to serve as an elevator by raising and lowering ships passing through the canal

to make ships move more quickly as they pass through the canal

to help ships unload their cargo as they pass through the canal

to serve as an elevator by raising and lowering ships passing through the canal

Explanation:

They act as elevators lowering them to next sea through the canal, or raising them to the other sea through the canal. Panama canal is a very good example of this.

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation: