Algae
urchin- as in a sea urchin. I think you meant the letter 'U' and not the word 'you.'
Nurse shark is an ocean critter. It begins with the letter N.
Atlantic and Arctic
Oceans of the world include the Arctic Ocean, Atlantic Ocean, Indian Ocean, Pacific Ocean and the Southern Ocean. They do not begin with the letter C.
islands
Killer whale is an ocean animal. It begins with the letter K.
No - capital letters are only for the start of sentences - or as the first letter of something that has a name (such as a person, building or street.
quayhog
anemone's, abalone
Um, seaweed...
· Yellowfin Pike
· Atlantic Cod