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.

d. migration of french settlers into english colonies

the enslaved people onboard suffered from illness with some frequency