Answer:They are related to the change of the climate and evolution because they are a big part of the ecosystem. A krill gets eaten by a small fish then a small fish get eaten by a bigger fish and it goes from there, that what fuels the ecosystem and environment. if you were to fidget with a fish population just a little you could maybe increase another species by a whole lot or kill of a different species. Also if you lowered the population of fish in Antarctica a lot of land animals would lower in population at the same time. considering polar bears eat fish and so do penguins which are 2 fat chunks of the food chain in Antarctica this could lower the population of land animals which is like a domino effect in th environment. one missing fish from the ocean is one more fish gone that could have fueled a bear or a penguin. these small population affects have big affects.
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