Over the last two decades the incidence of multiple
births has
a. increased in frequency by 60%.
b. decreased in frequency by10%.
c. remained relatively constant.
d. decreased the number of adoptions.
e. done none of these.
Answer: a
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Which one of the following annelid structures or events is not correctly paired with its role in locomotion?
A. circular muscles contract—segment becomes thin and long B. longitudinal muscles contract—segment becomes thick and short C. fluid in coelom—provides a hydrostatic skeleton D. septum—allows each segment to move independently E. chaetae—provides gas exchange surface for body muscles
Aerobic bacteria most likely evolved ____
a. directly from early protocells b. around hydrothermal vents c. later than cyanobacteria d. in a prebiotic soup e. through the process of endosymbiosis
Runners are modified stems that resemble
roots and are also known as a. stolons. b. rhizomes. c. bulbs. d. corms. e. tubers
Alligators excavate holes in the bottom of bodies of water. During times of severe drought these holes act as refugia for various aquatic organisms that might perish if there were no water available. Thus, alligators in this system can be classified as a(n)
A. symbiotic species. B. refugistic species. C. sympatric species. D. keystone species. E. allopatric species.