Men stopped wearing hats was due to the fact that the President himself stopped wearing them.
new plants and animals arrived:
grapes, wheat, horses, etc (view Columbian exchange)
What document gave parliament the power to tax
Answer:
South Carolina was outraged over British tax policies in the 1760s that violated what they saw as their constitutional right to "no taxation without representation". Merchants joined the boycott against buying British products. When the London government harshly punished Massachusetts for the Boston Tea Party, South Carolina's leaders joined 11 other colonies (except Georgia) in forming the Continental Congress.
I can't see the options.. but I hope this answers your question!
The president is at the top of the Federal Bureaucracy simply because that's the way that the Constitution made it. So, the Constitution makes the President the chief administrator of the Federal Government.