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.
The human oxygen-hemoglobin dissociation curve.
Atmospheric Gases Trapped in Ice at Vostok Station, Antarctica
Levels of Anxiety
Oxygen Transport: The Roles of Hemoglobin and Myoglobin
Carbon dioxide: The anthropogenic greenhouse gas of primary concern
An overview of the levels of organization in nature