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Some of the smallest creatures in the sea are also some of the most influential. Plankton, a group of microscopic marine organisms that includes bacteria, amoebas and snail larvae, among other things, prop up the base of the oceanic food chain. Every sea creature, from clownfish to whales, ultimately depend on plankton for food.

Now, a new study that peers into a past before human influence shows climate change has upset the distribution of plankton