The type of study that this is is observational study.
He is observing his team, each one of the members, in order to see how long they can hold their breath - which is why this is an observational study. Nothing is random here, there is no hypothesis, and there is no double blind, which means that the other options are incorrect.
National Security Letters (NSL) under Title V of the Patriot Act contain a gag order provision (which is a restriction from making information become public) and do not require a probable cause, a judicial review or prior approval from a judge and can be used against US citizens in search of terrorists.
Answer:
I'd say it's the first bullet point --know very little about current political issues but are able to identify some high profile political leaders.
Explanation:
People are more likely to remember a Senator or president, rather than explain what those people believe regarding law making and key political issues that arent widely popularized or related to them.
The rise of presidential power did not come about all at once. Nor did the growth of leadership follow a fixed and steady course. Some presidents have strongly exercised the power of leadership. Others have been relatively weak leaders.Since the time of George Washington many presidents have contributed to changing the powers of the office. People often have different views as to whether a president has acted wisely and exercised his power for the general good of the entire nation. Leadership takes many forms, and all leaders cannot appeal to all people. The leadership qualities of a few presidents, however, will serve to show how some have used the power of their office.
Increase secretions by the gastric glands
