Different scientists have speculated about how the first living thing appeared on Earth. All of the following are supported by evidence EXCEPT
A. origin on Earth of a photosynthetic autotroph.
B. origin on Earth of a chemosynthetic autotroph.
C. origin on Earth of an anaerobic heterotroph.
D. an organism arrived from an extraterrestrial source.
A. origin on Earth of a photosynthetic autotroph.
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The exclusive economic zone encompasses the area from the shore out to:
a. 3 miles. b. 12 miles. c. 20 miles. d. 100 miles. e. 200 miles.
Phagocytes are both mobile and found in fixed locations throughout the body
Indicate whether the statement is true or false
Secondary cell walls are stronger than primary cell walls because secondary cell walls contain
a. more pectin. b. less lignin. c. more chitin d. more lignin e. layers of cellulose fibrils at various orientations to one another.
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. Which of the following statements would be considered a hypothesis for this study? What will be an ideal response?