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. Canals have been used since ancient times to carry water where it is needed.
Answer:
Limited enjoyment of every day's life
Explanation:
Living without a purpose may seem freeing at first as the possibility of living as one wants is appealing. In the long term, however, people living this way start to drift and spend their day doing absolutely nothing, and they lack a motive for their daily activities.
Having a purpose in life gives people a motivation to carry out their activities even if they don't feel like doing them. If the purpose is clearly specified, for example, it is personal improvement or learning a new skill to get a better job, people would do their best to fulfill them which would in turn give them a feeling of satisfaction and accomplishment. Long-term plans and decisions are easier to make if there is a purpose behind them as they seem reachable and achievable.