12) dna and rna differ in all but one of the following ways. a) dna is double-stranded, while rna is single stranded. b) rna uses the sugar ribose in its backbone, while dna uses deoxyribose. c) dna contains the base uracil, while rna contains the base thymine instead. d) dna is found in chromosomes in the nucleus, while rna can move around the cell.

Apopulation of bears has genetic diversity. some of the bears have an allele that gives them thicker fur. due to climate change, the winters have gotten colder in their habitat. now the bears with thicker fur are becoming more common in the population. a.) which type of bear is selected for in the coldest ecosystem? b.) what must be the other allele for the type of fur, and what term would you use to describe the fact that the allele is becoming less common in the colder climate? c.) describe the change in the bear population in terms of changing allele frequencies and phenotypes d.) is this an example of natural selection