Read this excerpt from "dna testing." dna samples from insects preserved in amber can date back to before the time of the dinosaurs, which died out 65 million years ago. george poinar of oregon state university, for example, has even extracted muscle tissue from a 125-million-year-old lebanese weevil. this is, says poinar, "the best preserved protein on the face of the earth." so far, dna has been successfully extracted from about a half dozen ancient samples in amber. select the most accurate summary of kaku's argument.

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.