The oxygen minimum layer is found
a. in the ocean trenches.
b. mid-ocean.
c. just below the sunlit surface.
d. at the surface.
e. just above the abyssal plain.
C
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The taxonomy of the methanogens is based on
A) phenotypic analysis. B) phylogenetic (comparative nucleic acid sequencing) analysis. C) phenotypic and phylogenetic analyses. D) neither phenotypic nor phylogenetic analysis.
Transgenic bacteria are bacteria
A) found in the DNA of other organisms. B) that have hybridized with other species of bacteria. C) that produce genes used in recombinant DNA technology. D) that have a sequence of DNA from another organism inserted into them. E) that only have trans-DNA.
The average ocean temperature is shown in this graph with two different estimates using different methods. What has been the trend over time?
a. Ocean temperature has stayed the same since Earth formed. b. Ocean temperature has increased since Earth formed. c. Ocean temperature has decreased since Earth formed. d. Ocean temperature has fluctuated wildly and no discernable trend can be found.
According to the figure, what is occurring during day 2?
A. Luteal regression B. Menstruation C. Release of corpus luteum D. Copulation E. Ovulation