Question

introduced sewage in water systems ______.
a. decreases levels of phosphorus and nitrogen
b. increases oxygen levels
c. increases concentrations of solids
d. leads to decreases in the temperature

please select the best answer from the choices provided

a
b
c
d

Explanation:

Sewage contains organic and inorganic solid waste materials. When introduced into water systems, it adds these solids, raising their concentrations. Option a is wrong because sewage increases phosphorus/nitrogen. Option b is wrong as sewage lowers oxygen via decomposition. Option d is wrong as sewage does not decrease water temperature.

Answer:

C. increases concentrations of solids