Why do food chains and webs rarely support more than four or five trophic levels?
What will be an ideal response?
Typically, only 10% of energy is transferred from one trophic level to the next. There is not enough energy at the top trophic levels to support many organisms.
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Formation of Basin and Range mountains is a result of
a. thrust faulting. d. volcanism. b. folding and faulting. e. none of the above c. normal faulting.
A stable salt marsh community disrupted by a sudden decrease in salinity that kills a particular species of sea grass is
reestablished by a new species of sea grass that is more tolerant to changes in salinity is experiencing the process of ___________ Fill in the blank(s) with the appropriate word(s).
What are proxy data? Describe several examples of proxy climate data
What will be an ideal response?
Volcanic eruptions can affect the climate because
A. volcanic dust and gas can reduce the amount of solar radiation that penetrates the atmosphere B. they heat the atmosphere C. they change the elevation of the land D. all of the preceding