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Oak leaves in nature, design, heraldry and literature

Biggest fish: freshwater and marine champions

Maple leaf reveals its secrets

Gulf of Mexico - an ecological disaster of the XXI century

Passenger pigeon - an example of human folly

The equatorial forest - the lungs of our planet

The influx of the Rhine Main - the longest river in Germany

Breadfruit.

Where did the name Stars

Living organisms: their properties, the levels of the organization and classification

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