Look at the map. Which ecosystems show where early civilizations developed because the area allowed people to grow crops even during times with little rainfall? Select all that apply.

-Desert

-RainForest

-Savanna

-sahel

None of the ecosystems mentioned

Explanation:

As we know all the early civilizations were succesfully developed along rivers, like the Nile in Egypt, Euphrates and Tigris in Mesopotamia, the Ganges and Indus river in India and the Yangtze and yellow river in China

i need to see the answer to answer the question

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: