Sea creatures (i think you mean animals) are found in all parts of the sea. However, the pacific ocean holds 1/3 of all ocean wildlife.well mostly the bottom in the deep sea
The blue (baleen) whale. its about 30m long!! :)
I heard that salmon eats plankton, which eats microscopic organisms, but I don't know anything further than that.
some animals can't breath air they bring in very little air with their gills but if they go up on land they could dry out and die
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