Which is not part of William Smith's principle of faunal succession?
a.Radiometric dating can be used to date layers containing specific types of fossils.
b.No two species are exactly alike
c.Species become extinct and never "reappear"
d.Fossils can be diagnostic of a certain period of time
a.Radiometric dating can be used to date layers containing specific types of fossils.
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The Younger Dryas event tells us that ________
A) ice core samples are unreliable proxy records B) we have not always fully understood proxy records, since it turns out that what we call the Younger Dryas event actually took place before the Elder Dryas event C) climate change has not always necessarily been a gradual process D) the more recent warming trends have typically been associated with unusually dry periods
The model of human behavior widely used in neoclassical economics, that is, an all-knowing, self-interested individual who behaves rationally is called ________ ________
Fill in the blank(s) with correct word
Famines are most often serious when there is
A. No room to expand agriculture. B. Steady population growth. C. An attempt by indigenous people to return to old traditions and lands. D. A very serious drought. E. Armed conflict and political oppression.
Humus is associated with a ________
A) light color B) low cation exchange capacity C) "hard" consistency D) dark, gelatinous consistency E) low soil fertility