Were common ocean scavengers long ago, and they are frequently found in fossilized form.
a. trilobites
b. ammonites
c. foraminifera
d. stromatolites

It would be "A. Trilobites" who were common ocean scavengers long ago, and they are frequently found in fossilized form, since these are some of the earliest forms of documented life on earth. 

Um well north korea is a very harsh place because students go to school for 24 hours and almost never rest and the president is well i think sends to much bomb that’s what i think