Residence time is the ________
A) average length of time a molecule of a substance spends in the environment
B) length of time it takes for chemicals to be stored in the tissues of living organisms
C) chemical change that occurs with time, when substances alter the growth and development of humans
D) chemical change that occurs with time, when substances are altered by the sun or metabolized by microorganisms
E) length of time it takes to produce toxic chemicals in the environment
A
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During which stage of the cell cycle does a cell grow to approximately double of its original size?
A. mitosis B. gap 2 C. synthesis D. gap 1
It is possible to totally convert a given amount of mechanical energy into heat
A) True B) False
Permafrost lies beneath ____ percent of the land surface on Earth
A)0 B)10 C)20 D)40 E)50
As a wave begins to feel bottom near a shoreline, its wave height ________
A) decreases and its steepness decreases B) decreases and its wavelength increases C) increases and its frequency decreases D) increases and its wavelength decreases E) increases and its wavelength remains the same