Phytoplankton -> Zooplankton -> Krill->Fish -> crab -> Seal -> Orca
Orcas are apex predators, the top of any food chain they occupy.
In the oceans, they share top spot with the orca or killer whale.
shrimp fish penguins seals polar bears
Polar bears are apex predators, found at the very top of the food chain. Only humans and the occasional orca have been known to prey upon polar bears.
Cod Fish
No, they eat penguins and other seal species. They're like just under the orca in the food chain.
they eat krill
Dolphins are quite high on the oceanic food chain, but not quite at the top. The apex predator, the killer whale (or orca) does prey on dolphins.
The top of the food chain in the Southern Ocean that surrounds Antarctica is the Orca Whale, which is really the largest dolphin. There are no animals that live on Antarctica: it's too cold and there is no food chain to support life there.
Nothing eats bears, they are at the apex of the food chain.
Because the orca has no predators in Antarctic waters. The Antarctic cod provide excellent food for them, as do penguins, other birds and seals.