Speciation, especially among sexually reproducing species, happens in two phases: first geographic isolation, and then _____.
A. mutation
B. artificial selection
C. interbreeding
D. extinction
E. reproductive isolation
Answer: E
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Oceans cover the majority of the Earth's surface
Indicate whether the statement is true or false.
At present, after subtracting deaths from births, world population increases 1.2 percent per year for a doubling time of ________.
A. 140 years B. 14 years C. 280 years D. 70 years E. 58 years
How is magma created in a subduction zone?
A. Subduction brings one plate to a depth hot enough for minerals in the plate to melt. B. Friction between the two plates causes the lithosphere to melt. C. Subduction brings one plate to a depth hot enough for minerals to release water; this water causes melting in the overlying asthenosphere.
Ocean waves breaking on a beach are formed by
A. wind. B. earthquakes. C. tides. D. passing ships.