8. Large dense clumps of pampas grass along the American River resemble shoppers at a strip mall queueing up for the release of "Action Jackson: The Sequel" at Blockbuster; in addition the grass irritates many citizens as they pass by on their way to Target to purchase the movie's action figures

Ans 8. Large dense clumps of Pampas grass along the American River resemble shoppers at a strip mall queueing up for the release of "Action Jackson: The Sequel" at Blockbuster; in addition, the grass irritates many citizens as they pass by on their way to Target to purchase the movie's action figures.

1) Pampas must be capitalized because this is a region in Argentina.

2) The "in addition" is a conjunctive adverb, and it is spearating two independent clauses. Therfore, it must be separated with smicolon (;) in front and a comma (,) in back.