“Chlorochromatium aggregatum” is a symbiosis between a green sulfur bacterium and a
a. purple sulfur bacterium.
b. betaproteobacterium.
c. plant.
d. fungus.
Answer: B
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Scientists know that there has been a steady rise in atmospheric CO2 level since 1850 because ________
a. carbon isotope dating techniques indicate that this is so b. pockets of ancient atmosphere remain in Antarctic ice c. graphs of current increases can be extrapolated back in time d. reports by early researchers are stored in libraries
A type III survivorship curve is characteristic of:
a. monkeys b. horses c. eagles d. sea urchins e. humans
How does carbon buried in deep ocean sediments return back to the surface?
a. it floats to the surface b. it is brought up by fish c. storms stir up the ocean bottom d. wave motion brings it up e. uplifting of the sea floor
Figure 28.12
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The following question refers to the accompanying figure illustrating transport in phloem.
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Letter ____ can indicate a fruit or developing root cells.
A. A B. B C. C D. D E. E