The origin of the Earth's biological diversity is embodied in
A) ecological succession principle.
B) limiting factor.
C) the theory of evolution.
D) competitive exclusion principle.
E) the life zone concept.
C
Environmental & Atmospheric Sciences
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About ____ of U.S. lakes, rivers, and coastal waters were deemed unsafe for fishing and swimming in 1977.
A. one-tenth B. one-quarter C. half D. two-thirds E. 90%
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E-waste often leaches hazardous levels of which of the following metals?
A) lead B) uranium C) gold D) platinum E) silver
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What percentage of the world's photosynthetic activity is accomplished by phytoplankton in the euphotic zone?
A. 70 B. 60 C. 50 D. 40 E. 30
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A type of movement in which a block pivots about its base is a:
a. slide b. lateral spread c. rock block slide d. topple
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