CHAIN
Maybe its just my personal preference but the arrows in this picture should be going the other way to make more sense...
Phytoplankton is the first level of our food chain, followed by the zooplankton, which feeds on the phytoplankton. The zooplankton are then eaten by krill, fish and other crustaceans, which all go on to be eaten by big fish, penguins, seals, walruses and whales. The food chain continues when these are eaten by mammals like polar bears.
If you think about the food chain logically it is easy to understand. Without plankton, all of the oceans animals would die. Without phytoplankton, zooplankton would not have food and die. Without zooplankton, krill, smaller fish and other crustaceans would have nothing to eat and they would die, etc, etc. Until finally you get all the way out to large mammals like whales, dolphins, and manatees. All animals in the ocean depend on plankton for survival.
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