Which one of these provides evidence from development biology of a shared evolutionary history? a. the skeletal structures of a leg of a horse and flipper of a whale are very similar. b. both snakes and dogs have pelvic bones even though they are vestigial structures in the snake. c. the dna sequences of the cytochrome c genes in chimpanzees and spider monkeys are over 90% identical. d. both lobsters and frogs go through metamorphosis as a process in their life cycle.

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions,because prokaryotes don't have nuclei.