Which wetland type is known for low pH?
A) fringe wetlands
B) mires
C) bogs
D) bottomlands
C
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A hypothesized "first woman" (Eve) probably lived about ________ years ago.
A) 2,000 B) 20,000 C) 200,000 D) 2,000,000
What is NOT true regarding chlorofluorocarbons?
a. They are major destroyers of ozone. b. They release oxygen when they absorb UV light. c. They have been used as coolants and in solvents. d. They release chlorine radicals e. One of their chlorine atoms can degrade thousands of ozone molecules.
Compare and contrast isotonic, hypotonic, and hypertonic solutions. What happens when a normal animal cell finds itself in any of the three kinds of solutions?
What will be an ideal response?
Populations of amphibians, including frogs and toads, have been plagued by disease and high rates of deformity. A recent study investigated whether problems among the populations have arisen due to poisons from chemicals associated with agriculture. Biologists from the University of Florida collected local adult cane toads (Bufo marinus) from more than 20 different locations. Toads were collected from areas close to agriculture; both large-scale and small-scale farms as well as from suburbs. At collection sites where 50-97% of the adjacent land was farmed, males showed high levels of feminization. Feminized male toads were similar in color to females and had lower levels of testosterone and often also deformed gonads. These changes can lead to sterile males or changes in behavior that
prevent mating from occurring. At the end of their study, scientists stated that they had supported their theory that agricultural chemical cause deformities. a. true b. false