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

Environmental & Atmospheric Sciences

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Ocean waves breaking on a beach are formed by

A. wind. B. earthquakes. C. tides. D. passing ships.

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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.

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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

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Oceans cover the majority of the Earth's surface

Indicate whether the statement is true or false.

Environmental & Atmospheric Sciences