What percent of the ocean's biomass relies either directly or indirectly on organic matter supplied by photosynthetic primary productivity?
A) 98.00%
B) 98.50%
C) 99.50%
D) 99.90%
E) 100%
D
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Which of the following is not a way in which biodiversity directly helps society?
A) Buffer against extreme events. B) Insurance policy against the impacts of new diseases. C) Aesthetic and spiritual value. D) Prevention of global warming.
Why isn't dirt listed in the periodic table?
A) The periodic table lists only elements made of one kind of material. Dirt is a mixture of elements and compounds. B) Elements like dirt and air are so common that there is no need to list them in the periodic table. C) Dirt IS listed in the periodic table but is not easily recognized because it is listed as one of the rare earths with its old scientific name, dysprosium, symbol Dy. D) None of the above is true.
What is the correct name for KCl?
A) monopotassium monochloride B) potassium chlorine C) potassium chloride D) potassium ion chloride ion
The movement of Earth with the sun and the rest of the solar system in an orbit around the center of the Milky Way Galaxy is termed:
a. rotation. b. cosmic movement. c. galactic movement. d. revolution.