Which part of the respiratory system is correctly paired with its function? alveoli contract and relax to fill and empty the lungs. the voice box warms incoming air that enters the throat. goblet cells produce white blood cells to destroy pathogens. the epiglottis prevents food from entering the larynx.

Many state and local authorities are making laws regarding recreation on lakes, rivers, and oceans to reduce water pollution. why would lawmakers need to consult with scientists before making these laws? a) to make scientists feel important b) so that the laws reduce pollution by a sufficient amount c) so that parks and lakefront facilities will still make large profits d) so that the public will believe that the laws are important to follow

Which term refers to the total dollar value of the goods and services produced in a country in a year?

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.