How many chemicals in cigarettes are known or suspected to cause cancer? a) more the 10 b) more than 20 c) more than 50 d) more than 75 i think it c but idk could someone me

This is a pretty varied question actually. It is pretty horrendous that with all the guess work a more certain answer can't be agreed upon. There are just so much garbage in Tobacco smoke that we cannot even come to a complete conclusion.

However the most common estimates state that there are some 4000 chemicals in tobacco smoke, of which 400 are toxic chemicals, and 50 chemicals in particular that are known Carcinogens.

So your most likely bet is "C"

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)