How do oil spills affect The Great Barrier Reef

help? please?
Thank you.

(underwater with all the fishies and seaweed)

Seaweed: I cannot see the sun! I am dying! NOOOOO
Fish: I am eating the oily poisioned seaweed and i am dying! NOOOOO
Coral: I cannot see the sun! I am dying! NOOOOOO
Birds: My wetsuit is dirty! NOOOOO
more Birds: My food is dirty! NOOOOOO

bad cause and effect chain