Eutrophication in surface waters of developed and developing countries is generally caused by
A. non-filtered power plants wastes
B. addition of bacteria
C. runoff of nuclear waste
D. runoff of pesticides
E. runoff of fertilizers
查看答案
Defining characteristics of a wetland include
A. i
B. ii
C. iii
D. ii and iii only
E. i, ii, and iii
Which of the following would not be used to alleviate eutrophication in a lake?
A. applying herbicides to kill nuisance plants
B. planting rooted plants to increase O2
C. pumping oxygen into the lowest layers of water
D. introducing insects that eat certain nuisance plants
E. adding nitrates
A coastal ecosystem that has land on 3 sides, access to the ocean, higher water temperatures, low salinity, and rivers feeding into it is called a(n)
A. salt marsh
B. estuary
C. swamp
D. bog
E. reef
In a lake ecosystem, away from shore, sunlight will only penetrate to the end of the
A. littoral zone.
B. limnetic zone.
C. benthic zone.
D. intertidal zone.
E. profundal zone.
微信支付 
支付宝支付