What limits do writing from American civilizations before Spanish contact on American civilizations pre-1600 have as
historical sources?

6, 4, 5, 1 are true. the others are false.

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath. 

That is true , instead try to have a sit down talk with them