Answer:
True
Explanation:
Sewage contains many substances in it like suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. Hence it is said to be a complex mixture.
Yes. Indirectly, through plants. Without plants using photosynthesis, and therefore, creating oxygen, we wouldn't have enough breathable air.
True because it makes since and it’s a better answer than false
