Consider the phylogenetic tree shown above. Geographic labels indicate the origin of humans sampled for mtDNA sequence analysis. Chimp is the outgroup. Which of the following statements is correct?
A. The tree supports the "out of Africa
hypothesis" for the origin humans because it
implies that the common ancestor of all the
humans is of African origin.
B. The tree does not reveal anything about
the geographic original of humans.
C. The tree supports the multi-regional
hypothesis because there are four
independent populations.
D. The closest relative to the Kenyans are the
English.
E. The Chinese share a more recent common
ancestor with the Ethiopians than the
Kenyans.
A
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Answer the following statement true (T) or false (F)
Mutations are ___________________.
A. random B. beneficial C. always lethal D. always heritable E. largely predictable
In the Northern Hemisphere, recall that atmospheric CO2 levels are highest in early spring and lowest during early fall. What accounts for this seasonal fluctuation in atmospheric CO2 levels? Select all that apply
A. photosynthesis B. human activities C. respiration D. biomineralization E. plate tectonics
Scientists have proposed a number of mechanisms by which the xylem carries water to the tops of the highest trees. Which of the proposed mechanisms is the correct one?
a. capillary action b. guttation c. transpiration d. root pressure e. xylem pumps