After the demographic transition, birth rates
A. death rates exceed birth rates.
B. equal 2 ? death rates.
C. outpace death rates.
D. equal death rates.
E. None of these choices are correct.
D. equal death rates.
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Vascular plants hydrate photosynthetic cells using _________, whereas bryophytes do soVascular plants hydrate photosynthetic cells using _________, whereas bryophytes do so using _____________
A. surface water; soil water B. soil water; surface water C. xylem; phloem D. xylem; surface water
Which of the following carries amino acids to ribosomes?
a. mRNA b. tRNA c. hnRNA d. rRNA e. all of these
Which of the following is TRUE about waxes?
A) They are unsaturated and most similar to proteins. B) They are an important food source, and most animals have enzymes for breaking them down. C) They are a type of complex carbohydrate. D) They are saturated fats and are solid at normal outdoor temperatures.
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