Disadvantages, I believe, but am not sure are factual, were with a strong executive branch, the people feared that the president would manipulate his powers, just like the king of England had done so with the colonies and those who disagreed with it thought that the smaller sates wouldn't be voiced.
Answer: Select committee
Explanation: A select committee is a temporary committee established for the purposes of conducting special legislative business. They are formed through the resolution of the the legislative houses and through appointments. In some situations select committees are formed to carry out ordinary house businesses like Constitution Amendment committee,Budget committee etc.
The Cossacks is a group of Slavic people located between Ukraine and Russia that was created between the 14th and the 15th century by the emergence of 2 groups.
They played an important role in the 18th century during the Russian Empire, protecting its borders from Attacks, and participating in most of the wars.
They participated too in the Russian civil war in 1917, till they declared their independence in 1918.
We can still find Cossacks groups in Russia, Ukraine, United States, and of course other countries. They're considered as an ethnicity since 2010.
Hope this Helps! :)