Ineed it americans indians adapted to many differnt environments across north america. how did american indians of each cultural region make their shelter?

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: