Colonization by humans of Australia, the Americas, Madagascar, and New Zealand was soon followed by which of the following events?
A) widespread introduction of agricultural crops
B) extinction of a substantial portion of the vertebrate fauna
C) extinction of a substantial portion of the insect fauna
D) all of the above
Ans: B) extinction of a substantial portion of the vertebrate fauna
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A phospholipid molecule has a polar and a nonpolar end. Because of this, water molecules form
A. polar bonds with the nonpolar end of the phospholipid molecule. B. polar bonds with the polar end of the phospholipid molecule. C. hydrogen bonds with the nonpolar end of the phospholipid molecule. D. hydrogen bonds with the polar end of the phospholipid molecule. E. covalent bonds with the nonpolar end of the phospholipid molecule.
What are the different categories of exotoxins, and how do they function?
What will be an ideal response?
Trace fossils include all of the following except:
A. the mineralized skull of an ancient mammal. B. the trail left by a crawling worm. C. the impression of a bird feather. D. a dinosaur footprint. E. the burrow of an extinct crab.
It is now possible to analyze the genetics of an in vitro fertilized embryo by
a. fetoscopy. b. amniocentesis. c. chorionic villi sampling. d. pre-implantation diagnosis. e. post-implantation diagnosis.