Of the following, ________ can change global species diversity
A) emigration and extinction
B) immigration and extirpation
C) speciation and immigration
D) extirpation and extinction
E) speciation and extinction
E
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A radioactive isotope of element X (which is the parent isotope) is discovered in different amounts in four rocks. Which rock is oldest?
- 15% of element X remains in Rock A
- 28% of element X remains in Rock A
- 57% of element X remains in Rock A
- 75% of element X remains in Rock A
Which is not necessarily a characteristic of a red giant?
A) The engulfing of inner planets B) The expansion of atmosphere C) Becoming a supernova D) Materials sent into space from shattering
As it grows, a fault rupture that began at depth
A. stops growing once any part of the rupture reaches the surface. B. will grow until it reaches the mantle. C. has an oval shape below the surface. D. will grow until the seismic waves reach the surface.
How many units of energy are required to produce one unit of grain-fed beef?
a. One b. 10 c. 15 d. 25 e. 35