The answer to which two of the three are closest related is of course, the man and the cod. An octopus, or a lobster or a starfish are way way out, all being invertebrates, man and cod being vertebrates.
Another interesting day for evolution as the BBC presented a special report on teh discovery in north-eastern Ethiopia of a fossil of a three year old baby, 3.3 million years old. The news report said some oddthings like talking about humans adn apes, as we ourselves arenot apes... no doubt an example of dumbing down. Anyway, there is an excellent article on the BBC website, under the title of 'Lucy's baby found in Ethiopia'.
In the meantime, I started a Darwinist group on flickr today.