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

Land conservation is a worldwide priority. there are several methods to prevent the loss of land due to a variety of reasons. which method is not a way to conserve land? a) sea walls b) rainwater harvesting c) limits on clear cuts of forests d) cut and burn methods of clearing land