15. What nucleic acid is subject to alternative splicing? (A) DNA (B)rRNA (C)pre-mRNA (D)mRNA (E) tRNA

20. A phylogenetic tree is a diagram that describes a phylogeny. A phylogeny is (A) the evolutionary history of a species or group of species. (B)the geographic distribution of populations in a species. (C)the generations of individuals in a population. (D)the distribution of species in a given area in time. (E) a list of character traits of individual species set in a tree diagram.