As humans dispersed from the equator peoples skin got lighter and lighter because of fewer exposure to sun radiation.
They didn't get tanned as much :)
Within the legislative branch, each house of Congress serves as a check on possible abuses of power by the other. Both the House of Representatives and the Senate have to pass a bill in the same form for it to become law.
This process is called irrigation, and it is claimed that irrigation was developed there (and it was also developed in China independently around the same time).
In Mesopotamia people used an irrigation of canals: they had built a number of small channels that diverted the water from the rivers towards the fields.
In Egypt, the water of flooding was stored and re-introduced at a later time to prolong the "flooding" period.
(Egypt and Mesopotamia were two regions in the Fertile Crescent)
Answer: It began when Ronald Regan invented it
Explanation:
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