This country has built a sand wall around the disputed Sahrawi Republic
A) Mauritania
B) Mali
C) Malawi
D) Mozambique
E) Morocco
Answer: E
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Plankton that measure between 0.2 to 2 microns are classified, based on size, as which of the following?
A) Macroplankton B) Phytoplankton C) Picoplankton D) Virioplankton E) Zooplankton
Another name for diffuse light is ____
a. scattered light b. refracted light c. dispersion of light d. transmitted light e. diffracted light
What is the primary problem with the use of battery-powered cars?
A. Reduced gas mileage B. Storing enough electricity C. Lack of a hydrogen fuel source D. Excessive carbon dioxide production
What environmental factor does not change between "b" and "e" in the diagram?
A. Oxygen content B. Nutrient availability C. Light penetration D. Temperature E. All of these change between "b" and "e."