a - 4
b - 2
c --3
d - 1
Explanation:
<u>The 12th Amendment made a foundation change</u> in the process of the elections of the President and Vice President to make it more democratic and to have more people have a say in it.
T<u>he 20th amendment finalized the term dates</u> of Presidents and their cabinets and had laws for when there was no clear winner at the ballot.
<u>The 23rd amendment happened due to common demand</u> and allowed DC voters on the poll
<u>The 25th amendment came out of the tragic necessity </u>after John F Kennedy's assassination.
The Ice Age had a great effect on where people settled in americans since they were only able to reach North America through the Bering Land Bridge, which was only frozen due to the extremely low temperatures. Without this they would have had no way to leave Siberia.
The "Normans" <span>invaded England in 1066, led by William the Conquerer, since this invasion brought in a new era in England that caused many of todays customs to form. </span>
All of the above is the answer