Answer:
Okay. Adelie penguin, Crabeater (?) seal and emperor penguin = krill
Leopard Seal, Weddell seal = fish
Toothed whales will eat a lot of stuff, it's a genus, but a common food is = squid
Baleen (?) whale = phytoplankton, other zooplankton
Parasite or host... Whales have barnacles but that's is the only "host" on this list. I listed food by matching the predators to prey in the list, sorry if it doesn't help, maybe be more clear?
