14. Which of the following is the most accurate example of secondary succession?
A) Lichens and small spruce trees have established themselves in regions of Alaska where glaciers once existed but have since receded.
B) Twenty years after the Mount St. Helens eruption, small trees and grasses have begun to regrow near the top of the peak, where the eruption occurred.
C) Following the Dust Bowl of the 1930's, prairie grasses reestablished themselves in
areas had lost most of their fertile soil to wind erosion.
D) A forest fire burns down crowded understory grasses and shrubs as well as some
ponderosa pine stands in the Black Hills of South Dakota.

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.