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A transitional form between fish and tetrapods, or four-limbed vertebrates.
Giant sequoias are the world's largest living organisms by mass.
Blood vessels in fishes' gills absorb oxygen and release carbon dioxide.
Groups of western jackdaws are frequently found in cities. Konrad Lorenz analysed the complex social behaviour of these animals.
The saker falcon is a large bird of prey widespread in Europe and and Asia.
Plants are capable of converting inorganic substances (carbon dioxide and water) into organic sugar.
An orthopaedic disease of the foot, in which the longitudinal arch of the foot, formed by the tarsal bones, collapses.
The poisonous bite of the Chilean recluse spider poses a serious threat to human health.
One of the most common species of the Equisetaceae family.
