A standing crop of phytoplankton can be measure by ________.
A. counting the cells in a sample
B. weighing the cells in a sample
C. determining the chlorophyll a content of a sample
D. All of these are correct.
E. None of these is correct.
Answer: D
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Which of the following gases are mainly responsible for the atmospheric greenhouse effect in the
earth's atmosphere? a. oxygen and nitrogen b. nitrogen and carbon dioxide c. ozone and oxygen d. water vapor and carbon dioxide
How does relative dating differ from absolute dating? What will be an ideal response?
The figure above shows an upper-level 500 mb weather map drawn over North America. In what upper-air weather system is the star located?
a. A trough. b. A jet stream. c. A ridge.
China's economic growth rate is likely to decrease in the future because
A. factories are already moving to countries in Asia and other developing regions with lower wages. B. it is highly dependent on polluting fuels such as coal. C. there will be a labor shortage due to the one-child policy. D. the country's economy is highly dependent on exports to the United States.