What are the major morphological features that separate the clades of crustaceans from each other? answer thoroughly and include the scientific name of each clade

What role does a G nucleotide play in Tetrahymena pre-rRNA splicing? How does the Tetrahymena pre-rRNA position the G nucleotide for this role?

One strand (the top strand) of dsDNA is shown below, and the numbering goes from left to right. Transcript A extends from positions 21-33, and the sense strand is the bottom strand. Draw transcript A showing the 5’ and 3’ ends.