Answer:
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Explanation:
come here big mami
Dissolved organic substance present in natural water is a complex mixture compounds and contains most of the reduced carbon present in aquatic ecosytem . this can not be easily treated or disinfected by the conventional treatment . the experiments show that water sample with higher dissolved substance need higher cholrine demand . this is the reason that before disinfecting with chlorine ..... need to remove organic substance {{{ because it increase chlorine demand }}}
i mean it can be true and it cant at the same time. i mean medicine doesn't always work on a person. but it is said that medicine that is in powder form is more efficient.
but i believe its D or A
Aueyeowosy yo this is my answer
