The collection of elements that make up the human
body are worth approximately
a. 46 thousand dollars.
b. 30 million dollars.
c. 118 dollars.
d. 5 thousand dollars.
e. none of these.
Answer: c
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A proficient engineer can easily design skeletal structures that are more functional than those currently found in the forelimbs of such diverse mammals as horses, whales, and bats. The actual forelimbs of these mammals do not seem to be optimally arrange
d because _____. A) natural selection has not had sufficient time to create the optimal design in each case, but will do so given enough time B) in many cases, phenotype is determined by genotype and the environment C) though we may not consider the fit between the current skeletal arrangements and their functions excellent, we should not doubt that natural selection ultimately produces the best design D) natural selection is generally limited to modifying structures that were present in previous generations and in previous species
The DNA-histone complex is most analogous
to
a. a pearl necklace. b. a waterproof watch. c. a microwave oven. d. the gears on a bicycle. e. a flashlight
Bacteria in the intestinal tract assist their hosts by ____
a. helping with digestion b. eating other bacteria c. producing minerals reptiles cannot d. producing stomach acid e. encouraging the growth of pathogens
Exotic species that are introduced into a non-native habitat can ____
a. interbreed with native species b. drive endemic species to extinction c. die out due to competition from native species d. blend in with endemic species e. create habitat islands for themselves