Which of the following is NOT an example of a prezygotic isolating mechanism?
a. An iris blooms at a different time of the year than a daffodil.
b. A peacock puts on a different mating display than a sparrow.
c. A snail with a shell coiling in one direction cannot mate with a snail whose shell curls the
other way.
d. A zebroid is sterile.
e. One type of roundworm would reject the sperm from another species of roundworm.
D
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Impetigo is caused by ________.
A. C. diphtheriae B. S. pyogenes C. C. perfringens D. S. aureus E. Both S. aureus and S. pyogenes are correct.
Trichomoniasis vaginalis is a sexually transmitted disease that can also survive on moist surfaces and in urine for several hours. As a result, trichomoniasis
A) is difficult to treat. B) is not a good candidate for eradication. C) can be spread by contact with contaminated toilet seats, sauna benches, and towels. D) is more common in males.
Most of the animals living in the sandy intertidal are:
a. infaunal. b. epifaunal. c. epiphytic. d. planktonic. e. nektonic.
Characteristics of eudicots include all EXCEPT
A. woody or herbaceous plants. B. flower parts in fours and fives. C. leaves with netted veins. D. vascular bundles arranged irregularly in the stem. E. two cotyledons.