Pesticides that break down quickly in the environment are called
A. persistent pesticides.
B. nontarget pesticides.
C. insecticides.
D. nonpersistent pesticides.
Answer: D
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What nation has had almost half of its entire population displaced by 2016 due to civil war and sectarian conflict?
A) Yemen B) Iran C) Iraq D) Sudan E) Syria
After three half-lives, ________ of an original, radioactive, parent isotope remains and the rest has decayed into the daughter isotope
A) 75% or three-fourths (3/4) B) 50% or one-half (1/2) C) 25% or one-fourth (1/4) D) 12.5% or one-eighth (1/8)
This gas has a distinctive reddish-brown color: ________
Fill in the blank(s) with correct word
The diagram below reminds us that
A) ecosystem structures tend to occur on land and ecosystem functions tend to occur on water.
B) ecosystem functions are dynamic processes that support the ecosystem.
C) ecosystem structures and functions are largely the same in most ecosystems.
D) ecosystem functions occur on long time periods.