During the drinking water treatment process, a chemical is added at the stage so that suspended particles, such as mud and sediment, will stick together, settle out, and can be removed.

a. aeration b. chlorination c. coagulation d. softening

Which statement describes characteristics of planarians? a they live in oceans, are parasites, and reproduce only sexually. b they live in fresh water, are parasites, and reproduce only asexually. c they live in oceans, are free living, and reproduce sexually and asexually. d they live in fresh water, are free living, and reproduce sexually and asexually.