The construction of levees can actually increase the risk of a catastrophic flood
Indicate whether the statement is true or false
TRUE
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South Africa remained isolated from the global economic system until the 1990s because of its policy of _______________.
Fill in the blank(s) with the appropriate word(s).
An intertidal species of seastar helps to maintain the diversity of the intertidal region by controlling the mussel population. Without the seastar, the mussel population would crowd out other species and take over their territory
The seastar could be called a(n) a. indicator species b. keystone species c. foundation species d. aggressive species e. repressor species
There has been some success in the war against Argentine fire ants by using parasitic flies that make the heads of the ants fall off
Indicate whether the statement is true or false
Use of microbes and other life forms to remove toxic contaminants from soil and ground water
A. offers considerable promise for cleaning up contaminated material. B. is the only fully risk-free method of decontamination devised so far. C. works but is less cost-effective than other approaches. D. does not seem able to fulfill its early promise.