Which of the following is true about microorganisms?
  a. 
microorganisms can have both beneficial and detrimental effects on other organisms.
  b. 
microorganisms never have any effect on other organisms.
  c. 
microorganisms can have only beneficial effects on other organisms.
  d. 
microorganisms can have only detrimental effects on other organisms

Karen is waiting by the lockers before school for her friend richard. they had agreed to look over the history review sheet together to be ready for the test later that day. richard shows up late with uncombed hair and wrinkled clothes. karen: "you're five minutes late and you look like a wreck! " richard: (slams his locker) "you know, i don't have time for this." karen: "fine! figure out the test on your own! "