A covalent bond is likely to be polar when _____
A) one of the atoms sharing electrons is more electronegative than the other atom
B) the two atoms sharing electrons are equally electronegative
C) carbon is one of the two atoms sharing electrons
D) the two atoms sharing electrons are the same elements
A
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Two species of tree frogs that live sympatrically in the northeastern United States differ in ploidy: Hyla chrysoscelis is diploid, and Hyla versicolor is tetraploid. The frogs are identical in appearance, but their mating calls, which females use to find
mates, differ. Which difference most likely evolved first? A) polyploidy B) difference in mating calls C) Polyploidy and different mating calls must have evolved at the same time.
Botanically, the fibers in your cotton t-shirt are _____
a. angiosperm seeds d. fibers from pine needles b. gymnosperm seeds e. cellulose-rich hairs c. lignin fibers
Which of the following is not a factor that weakens host defenses against infections?
A. Old age B. Chemotherapy C. Physical and mental stress D. Genetic defects in immunity E. Strong, healthy body
American bison consume only plants, so we would say they are ________
A) carnivores B) herbivores C) omnivores D) producers