Which institution has the authority to make and enforce laws for a community?

Government is the institution which has the authority to make and enforce laws for a community.
The other options were church, school, and family - these do not have the authorization to make any laws within an entire community. School can make laws within that school only; families don't have their own laws; churches cannot create laws because there's not only one religion. So the only institution that can actually make laws which people within a community are legally obliged to follow is the government. 

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath. 

Yes you are cute answer theories to explain the colonization of the new world the last great habitable landmass to be occupied by humans focus on the bering land bridge, or beringia, which emerge by siberia and alaska the last ice age.