Which of the following best matches the description?A serious effect that occurs after prolonged exposure to small doses of a toxin.
A. acute toxicity
B. Superfund
C. hazardous wastes
D. RCRA
E. National Priority List
F. synergism
G. corrosiveness
H. toxicity
I. LD50
J. CERCLA
K. ignitability
L. threshold levels
M. reactivity
N. waste minimization
O. chronic toxicity
Answer: O
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If the half-life of carbon-14 is about 5,700 years, then of a given starting quantity, after 22,800 years (four half-lives), what fraction of the original amount will be left?
A. none B. 1/8 C. 1/4 D. 1/16
Which of the following occurs in the proximal tubule?
A) Blood pressure pushes fluid out of the capillaries. B) Glucose is transported from the blood into the filtrate. C) Certain amino acids are transported from the filtrate to the blood. D) Water reabsorption occurs.
Tsunamis and earthquakes have killed millions of people during human history. What branch of the Earth sciences is the main group that studies these phenomena?
A) Meteorology
B) Geology
C) Oceanography
D) Astronomy
only ______ of the Sun's energy reaches the earth.
a - 1 millionth b - 2 millionth c - 1 trillionth d - 1 billionth e - 2 billionth