Chlorinated hydrocarbon pesticides, like DDT, are synthetic versions of
A) heavy metals.
B) non-biodegradable, persistent molecules.
C) ions and salts.
D) vitamins and minerals.
B
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Human population is currently following a J-shaped growth curve. Which of these hypothetical factors would maintain this growth pattern and prohibit the growth curve from turning into an S-shaped one?
A. New medicines to stop the spread of disease B. Better farm machinery C. New fossil fuel supplies D. Improved factory fishing boats
The fastest moving planet that orbits the Sun is the
A. most massive planet. B. planet farthest from the Sun. C. smallest planet. D. planet nearest the Sun.
Seawater is an important source of table salt
Indicate whether the statement is true or false
The relative humidity would be ________% if the actual water vapor in the air were 10 grams per cubic meter, the air's capacity to hold water vapor were 20 grams per cubic meter, and the dew-point temperature was 20 degrees Celsius
A) 10 B) 20 C) 50 D) 2 E) 200