How does propionibacterium acnes cause acne in humans? a. overuse of antibiotics can cause bacteria to clog pores in humans. b. this type of bacteria is found on the human skin, and it can clog pores. c. this type of bacteria often enters a cut and causes an infection in humans. d. close contact with an infected person can lead to acne in humans.

The correct answer is 

B.) This type of bacteria is found on the human skin, and it can clog pores.

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on