Which best describes how mrna is put together

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

The buildup of sediments where a river empties into a slow-moving or nonmoving body of water is known as a/an

Match with o for organic and i for inorganic for each compound