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Microscopic algae and the nearly invisible animals that eat them do more than just drift along the ocean surface. Plankton , defined by their habitat, not their taxonomy, are the foundation of the marine food chain--without them, marine life would go hungry and food chains would collapse. They also remove carbon dioxide from the sea and provide Earth's atmosphere with oxygen

Play an important role in gathering data about birds and their habitat, using mobile technology as a scientific tool [More]

The number of Adelie and chinstrap penguins living on the Antarctic Peninsula has plummeted by more than half during the past 30 years. Scientists once believed that climate change would create a stark contrast between the two species.

Dear EarthTalk : Recent news reports have revealed the discovery of previously unknown species inhabiting the deepest parts of our oceans. Is anything being done to protect this habitat before humans have a chance to fish it to death or otherwise destroy it? --Matthew Polk, Gary, Ind.