your definition for each word has to be exactly whatever number is listed next to it. Please help I would appreciate it:)

Greg goes to a high school and observes the way students talk to each other. he makes notes on the words used, the atmosphere of the school and the way the students present themselves to each other. this is an example of a( research method.

Congress checks on the power of the presidency by overriding a presidential reversal or veto. debating the bill in both of the houses. making laws without presidential review. sending the bill back to several committees

Which statement about spreading knowledge of diseases and health around the world is correct?