In the section "Investigating Life: Evolving Backwards," how did the scientists test the hypothesis?
A. They examined decrease in length of hind limbs in marine snakes.
B. They compared anatomy of fossil ancestors and extant snakes.
C. They compared anatomy of snakes, other reptiles, mammals, and birds.
D. They examined decrease in length of hind limbs in land-dwelling snakes.
Ans: B. They compared anatomy of fossil ancestors and extant snakes.
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An untied inflated balloon flies because
(a) the pressure is higher inside than outside the balloon. (b) the pressure is lower inside than outside the balloon. (c) air flows down its pressure gradient. (d) both a and c occur.
Crambin is ___________________
a. mildly hydrophobic b. extremely hydrophobic c. mildly hydrophilic d. extremely hydrophilic
Chemical evolution started on Earth
a. after the appearance of prokaryotic cells. b. long before any cells emerged. c. after the appearance of eukaryotic cells. d. after the appearance of eukaryotic cells but before the appearance of multicellular organisms. e. after the appearance of multicellular organisms.
Several new tetraploid species of a plant called salsify (Tragopogon) have arisen in western North America. These new species each arose from a diploid species that went through the process of allopolyploidy. This mode of speciation is a type of ________ and it occurs ________.
A. sympatric speciation; very slowly B. sympatric speciation; almost instantaneously C. allopatric speciation; almost instantaneously D. allopatric speciation; very slowly E. adaptive radiation; very slowly