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.

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen

Where does all the water go? according to the environmental protection agency (epa), in a typical wetland environment, 39% of the water is outflow; 46% is seepage; 7% evaporates; and 8% remains as water volume in the ecosystem (reference: united states environmental protection agency case studies report 832-r-93-005). chloride compounds as residuals from residential areas are a problem for wetlands. suppose that in a particular wetland environment the following concentrations (mg/l) of chloride compounds were found: outflow, 60.4; seepage, 73.7; remaining due to evaporation, 26.4; in the water volume, 46.8. (a) compute the weighted average of chlorine compound concentration (mg/l) for this ecological system. (round your answer to one decimal place.) mg/l (b) suppose the epa has established an average chlorine compound concentration target of no more than 58 mg/l. does this wetlands system meet the target standard for chlorine compound concentration? yes. the average chlorine compound concentration (mg/l) is too high. yes. the average chlorine compound concentration (mg/l) is lower than the target. no. the average chlorine compound concentration (mg/l) is lower than the target. no. the average chlorine compound concentration (mg/l) is too high.