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Interrelationships within a food web can be so intricate that a chain of disruptive events can occur when one ecosystem component changes. Polar bears rely on seals for food. The seal population may decline if Arctic Cod, a key food supply for seals, dwindles. Cod eat zooplankton, and zooplankton eat ice algae. If climate change causes sea ice to melt, the ice algae population drops, creating a cascading effect that reduces the polar bear population
When examining the transfer of energy within food chains and good webs it is important to not how they are interconnected and determine the effects of losing a species within a food web/chain
A biome is defined as a large geographical region that has a particular type of climax community. A biome is therefore a distinct ecological community of plants and animals living together in a particular climate. The .

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