Briefly explain how the phylogeny of an extinct group can be determined
If sufficient fossil material is available for a significant amount of geologic time, a group's evolutionary trend may be determined by changes in internal or external skeletal features.
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Complete the following nuclear equation:
Tl ? 
Pb + ??
A. 
e
B. gamma ray
C. 
He
D. both A and B
E. none of the above
Dust from Africa is most commonly found in the American
A) northwest. B) southwest. C) northeast. D) southeast.
Plants that can best resist a variety of environmental challenges are most likely
A) domesticated plants with little genetic variation. B) cultivars with little genetic variation. C) wild plants with high degrees of variation. D) wild plants with low degrees of variation.
As in the tropics, soils in ____ climates tend to have limited fertility because of rapid removal of soluble nutrients
a. humid subtropical b. subarctic c. marine west coast d. humid continental, hot summer e. humid continental, mild summer