Find the odd one out:
i. Physalia, Hyalonema, Ruplectella, Spongilla
ii. Planaria, Liverfluke, Filarial worm, Tapeworm
iii. Star fish, Sea-urchin, Nereis, Sea-cucumber
iv. Cockroach, Butterfly, Spider, Honey bee
v. Amphioxus, Herdmania, Doliolum,Oikopleura