Which is the closest living relative to a bird?
a. lizards
b. crocodiles
c. bats
d. dinosaurs
e. winged insects
ANSWER: b
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Synthetic anabolic steroids:
A. All of the answer options are correct. B. promote protein synthesis. C. promote anabolic metabolism to store energy within cells. D. build and strengthen muscle tissue. E. interfere with the normal production of anterior pituitary tropic hormones.
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. Based on this study, what is the control group? What will be an ideal response?
Inductive reasoning
What will be an ideal response?
Which of the processes named here is the least likely to contribute to the evolution of genetic diversity of bacteria and archaea?
A. Sexual reproduction B. Horizontal gene transfer C. Mutation D. Binary fission