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
b. false because they were testing a hypothesis not a theory.
You might also like to view...
How many molecules of CO2 are needed to generate one molecule of glucose?
A. 2 B. 3 C. 4 D. 5 E. 6
Is photosynthetic O2 production light-dependent?
a. Yes b. No
The natural role of restriction enzymes in bacteria is to
A) make conjugation more efficient. B) allow transposons to move to another place in the chromosome. C) protect the cell from invading phages. D) allow cells to accept foreign DNA. E) provide the cell with new phenotypes, such as antibiotic resistance.
The information stored in the DNA sequences is used directly as a template to make ___________
(a) lipids. (b) RNA. (c) polypeptides. (d) carbohydrates.