Answer:
Locks are used to make a river more easily navigable, or to allow a canal to cross land that is not level. Later canals used more and larger locks to allow a more direct route to be taken.
OR
Door locks are used externally to limit entrance into private home and public buildings. The type of locks been used externally includes: Mortise Lock: this is a complete set of locks encased in a square or rectangular shaped metal box to provide the lock with the needed security!!
This answer is C hope this helps..........
Is there any data to provide? But going off of common knowledge id say either stop signs or traffic signals
He proved that baseball wasn't just a white sport, that not just African Americans, but all "colored" races could play/do what they wanted as long as they put heart into it.
Answer:
It is giving up principles to pacify an aggressor. Winston Churchill opposed the policy of appeasement by blatantly saying Britain and France had to choose between war and dishonor. They chose dishonor.
