Some planktonic cyanobacteria have the ability to "fix" which of the following elements, thus having a fertilizing effect on the marine environment similar to the ability of the land plants legumes?
A. hydrogen
B. oxygen
C. nitrogen
D. helium
Answer: C
Environmental & Atmospheric Sciences
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Longshore currents carry beach material perpendicular to the coast.
Indicate whether the statement is true or false.
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According to the World Health Organization, the root cause placing people at the highest risk of disease is
A) infectious disease. B) cancer. C) heart disease. D) poverty.
Environmental & Atmospheric Sciences
Most caves and caverns originate by solution of limestone
Indicate whether the statement is true or false
Environmental & Atmospheric Sciences
Wetlands perform a major ecosystem service of trapping and filtering water as it passes through the wetland area.
Answer the following statement true (T) or false (F)
Environmental & Atmospheric Sciences