Most commercial pesticides are effective for only 2 or 3 years because
A) the chemicals induce mutations that provide immunity.
B) new pests invade the area.
C) the chemicals mutate and become ineffective.
D) the pests learn to hide when the chemicals are being applied.
E) those pests born with mutations that provide immunity will survive and reproduce.
E
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Two-thirds of the American population suffers from disorders determined by multiple genes and environmental factors
A. true B. false
Escherichia coli and Salmonella can live in our intestines in the presence or absence of oxygen. They are considered which of the following?
A. autotrophs B. facultative anaerobes C. obligate anaerobes D. aerobic E. phototrophs
Evaporation of water from the surface of leaves is
A. hydrolysis. B. oxidation. C. transpiration. D. condensation. E. sublimation.
The area in the figure marked "A" is likely to
become a. vacuoles. b. Golgi bodies. c. mitochondria. d. chloroplasts in some cells. e. endoplasmic reticulum