Which of the following is causing widespread concern?
A) As atmospheric oxygen levels decline, the ozone layer is being destroyed.
B) As atmospheric carbon dioxide levels decline, the ozone layer is being destroyed.
C) As levels of methane decline, average global temperatures are increasing.
D) As levels of carbon dioxide increase, average global temperatures are increasing.
Question 2
Insecticides would be most useful in combating
A) mosquitoes that spread malaria.
B) weeds that infect our agricultural fields.
C) bacteria, such as Salmonella, which sometimes contaminate meat.
D) fungi that contribute to molds and mildew that lead to respiratory infections.
Sunlight on Mars is dimmer than on Earth. This photo of a Martian sunset was imaged by Mars Pathfind
Oxygen Equipment 1
Due to compressibility, atmospheric mass gradually “thins out” with height.
Advection of cold and warm air at different levels.
Stable oxygen isotopes in water
Structure of hemoglobin, the oxygen-transporting protein of red blood cells. It consists of four glo