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?
male toads collected from the suburbs
You might also like to view...
In the circulatory system of a frog, the _____ circulation supplies the body tissues, while the ______ circulation supplies the respiratory surfaces.
A. systemic, pulmocutaneous B. pulmocutaneous, systemic C. systemic, cutaneous D. pulmocutaneous, systolic E. None of the choices for this question are correct.
In the figure above, the honeycomb on which
the bee is standing is made up primarily of which of the following:a. carbohydrates b. nucleotides c. proteins d. lipids e. amino acids
The ________ reaction sequentially links adjacent amino acids into the growing polypeptide chain.
A. propeptidation B. dipeptidation C. peptidation D. transpeptidation
In which of the following cases is RhoGAM not given to the RH- mother in order to prevent hemolytic disease of the newborn?
A) within 72 hours of delivery B) around the 8th week of pregnancy C) following an episode of vaginal bleeding during pregnancy D) subsequent to miscarriage or abortion E) after amniocentesis or chorionic villus sampling