There are 20 naturally occurring amino acids, and each one only varies in the structure of the R side chain. two amino acids are shown in model one. what are the R side chains in each?

Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.