What type of bond is formed if one atom is more electronegative than the other atom?
a. covalent
b. hydrogen
c. polar covalent
d. van der Waals
e. nonpolar covalent
c
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. Humans are the only reservoir for varicella-zoster
Indicate whether this statement is TRUE or FALSE.
Which of the following is true about soil horizons?
a. They vary in number but are all of equal depth. b. There are always four of them, but they vary in depth. c. They vary in number and depth. d. There are always four of equal depth.
While walking in a forest, you find a plant with what appears to be unfertilized seeds located at the bases of woody scales exposed to the air. Yellow dust-like particles coat the surface of the unfertilized seeds. This plant is probably a(n)
A) gymnosperm. B) bryophyte. C) angiosperm. D) alga. E) seedless vascular plant.
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?