In a __________, water or some nutrient moves from an environmental reservoir, through organisms, then back to the
environment. Fill in the blank(s) with the appropriate word(s).
ANSWER: biogeochemical cycle
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Methane is an important greenhouse gas whose levels in the atmosphere are also rising. This is because:
A. methane is generated by archaeons living in the guts of cattle, and beef production is increasing. B. methane is generated by archaeons living in waterlogged rice paddies, and rice production is increasing. C. methane is released when permafrost at high latitudes melts, and more permafrost is melting. D. methane is generated by archaeons living in the guts of cattle and in rice paddies, and both beef and rice production are increasing. E. All of the above.
Extinction is most likely an example of ____
a. microevolution b. macroevolution c. orthogenesis d. uniformitarianism e. gradualism
Which type of microscope provides the greatest depth of field?
a. light b. scanning electron c. transmission electron
During conscious, quiet rest, the brain is emitting:a
alpha waves. b. beta waves. c. delta waves. d. gamma waves. e. rapid, irregular waves.