The European Union's experience with polybrominated diphenyl ethers (PBDEs) has shown that ________
A) if the toxin is removed from the environment, concentrations in human tissues fall
B) exposure to these molecules results in birth ratios of 9 males : 1 female
C) human metabolism of these compounds could solve the problem without legislation
D) these molecules can be rapidly metabolized by decomposers
E) economic factors have superseded health concerns
Answer: A
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A) phosphorus and nitrogen-based fertilizers. B) sand, silt, and clay suspended in water. C) fish, aquatic insects, algae and other live aquatic organisms. D) organic biodegradable material that requires oxygen to be decomposed by bacteria.
In the figure below, a tectonic terrane is shown at
A. ocean plateau. B. linear island chain. C. continental fragment. D. island arc. E. All of these.
Which of the following is TRUE of eutrophication in marine systems?
A) It can lead to algal blooms and red tides that kill fish. B) It does not occur. C) It provides needed limiting nutrients. D) It can aid corals by killing parasites. E) It is rare and occurs only in bad weather.
A landscape in a state of dynamic equilibrium experiences no change
Indicate whether the statement is true or false