Earth's biodiversity remains a reservoir for ________.
A) water and waste production by humans
B) pests and disease
C) habitat extinction and species destruction
D) foods and medicines
E) oil and coal
Question 2
When examining the Keeling Curve in the accompanying graph, one notices a zigzag upward-moving curve. What do these small up and down movements indicate?
A) weather-related factors affecting CO2
B) seasonal cycles in CO2 concentrations
C) O2 versus CO2 concentrations
D) latitudinal differences in CO2 concentrations
E) uncertainty in the CO2 conditions
Water Gradient
The Tilt of Earth’s Axis
Biodiversity Depends on the Size of Habitat
The original Neandertal remains from the Neander Valley, Germany.
Epidemiologists look for the causes of disease, such as toxic waste and industrial pollution, at the
Daily Water Balance in the Body