25. Which one of the following, if present in a urine sample, would likely be caused by trauma?(A) a
27. Trace elements are those required by organisms in only minute quantities. Which of the following
28. Which of the following pieces of evidence most strongly supports the common origin of all life o
31. Which of these should decline in hybrid zones where reinforcement is occurring?(A) gene flow bet
32. The largest unit within which gene flow can readily occur is a(A) population. (B) species. (C) g
33. Which statement represents the best explanation for the observation that the nuclear DNA of wolv
34. Which of these statements about prokaryotes is correct?(A) Bacterial cells conjugate to mutually
35. If all prokaryotes on Earth suddenly vanished, which of the following would be the most likely a
36. Which of the following is an ongoing trend in the evolution of land plants?(A) decrease in the s
37. Cephalization is primarily associated with(A) adaptation to dark environments. (B) method of rep
38. The distinction between sponges and other animal phyla is based mainly on the absence versus the
39. What would be the most effective method of reducing the incidence of blood flukes in a human pop
40. Which of these is NOT considered an amniote?(A) amphibians (B) nonbird reptiles (C) birds (D) eg
42. We tend to think of plants as immobile when, in fact, they can move in many ways. All of the fol
44. Carrying capacity is(A) seldom reached by marine producers and consumers because of the vast res
45. The emergence of 14 species of Galápagos finches from a common ancestor that finds itself in a n
46. The life history strategy of an k-selected species is to(A) take advantage of human activity, su
47. Which of the following mechanisms is essential for animal navigation?(A) a time keeping mechanis