EVERYDAY SCIENCE

Detailed explanation-1: -The cement sector is the third largest industrial source of pollution, emitting more than 500, 000 tons per year of sulfur dioxide, nitrogen oxide, and carbon monoxide.

Detailed explanation-2: -Septic tanks are often used in rural areas, campgrounds, and picnic areas in place of sewer systems to treat human waste and separate solids and liquids in wastewater. The liquid portion of the waste is disposed of through a drain field where natural filtering takes place in the soil.

Detailed explanation-3: -Researchers found high levels of vitellogenin-a protein involved in producing egg yolk-in many smallmouth bass. In male fish, the gene that tells the body to produce vitellogenin is usually “turned off, ” explains Iwanowicz. That gene only “switches on” in the presence of estrogen, a female sex hormone.

Detailed explanation-4: -Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? pathogen pollution.