The susquehanna river, which runs through the states of new york, pennsylvania, and maryland, received the designation "america’s most endangered river" in 2005. one of the river’s problems results from the large number of sewage overflow sites that are found along the course of the river. these sewage overflow sites are a direct result of an increase in
a. global warming
b. recyling programs
c. human population
d. atmospheric changes

Which of the following is a consequence of urban heat islands? increased precipitation downwind of the city? increased precipitation upwind of the city? decreased winds within the city? increased winds within the city?

Are the layers of rock above and below the coal older or younger?

Which of the following statements is correct in hour our immune system responds to a potential pathogen? a. the adapted immune system will call on the innate immune system to destroy the pathogen. b. b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c. the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. d. the t-cells in the adapted immune systems are the first to recognize the pathogen vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a. antigen, antibody b. antibody, antigen c. antibody, antibiotic d. antibiotic, antibody