minessieamaridi minessieamaridi
  • 26-01-2017
  • Health
contestada

Secondary treatment uses _______ to clean the water.
a. chemicals
b. microorganisms
c. screens
d. skimmers

Respuesta :

redhead0507
redhead0507 redhead0507
  • 01-02-2017
the correct answer is B. microorganisms 

Answer Link

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