Assuming 10-percent trophic efficiency, the other 90 percent of the energy associated with a given trophic level is ________.
A. lost as heat
B. transferred to lower trophic levels
C. converted to bioluminescence
D. transferred to higher trophic levels
Answer: A
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Hydrocarbon products (such as oil) can exist in the form of gas, liquid, or solid.
a. true b. false
The Protestant Reformation elevated work to the status of a moral obligation, paving the way for capital accumulation
Indicate whether the statement is true or false
This was probably the predominant gas in Earth's earliest atmosphere:
A) argon. B) hydrogen. C) water vapor. D) nitrogen.
Changes in day length, the Sun's altitude above the horizon, and the Sun's declination over the course of the year
A) are factors that follow an irregular, random cycle. B) are phenomena that occur only at the equator. C) have little overall effect or importance in physical geography. D) are responsible for the seasons. E) produce Earth's rotation.