The answers are, in order, the Krebs cycle and oxidative phosphorylation.
Answer: A) England become more Scandinavian.
Explanation: Norman Conquest, the military conquest of England by William, Duke of Normandy, primarily effected by his decisive victory at the Battle of Hastings (October 14, 1066) and resulting ultimately in profound political, administrative, and social changes in the British Isles. The Norman Conquest changed the face of England and Western Europe forever: The Norman Conquest broke England's links with Denmark and Norway and connected the country to Normandy and Europe. William got rid of all the Saxon nobles and imposed the feudal system on England.
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Another way your question could be framed is “why do nations use imperialism on weaker countries?” and the simple answer is there are several motives such as ethnocentric purposes, religion, access to natural resources, expanding power, etc. Specifically people resort to imperialism on weaker countries because they are vulnerable to accept whatever helps the people survive in times of unrest.
The treaty of Guadalupe Hidalgo, was forced onto the remnant Mexican government which caused the war.
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