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Birds are warm-blooded animals that lay hard-shelled eggs. The eggshell is made mostly of calcium carbonate.
Certain social groups are not able to break out of their lifestyle forced upon them by prejudices and discrimination, so their standard of living remains low.
Among the problems of a crowded metropolis are the surrounding slums, homelessness and air pollution.
Species of the Ursidae family can be found all around the world. They are mostly large-bodied with quite diverse diets.
After World War II, Germany was divided and the Iron Curtain was drawn.
This video shows why the Barbary sheep on the savannahs bear such a strong resemblance to goats.
When the population of a town increases drastically, mass housing needs can only be satisfied with cheap solutions.
The largest cities in the world are often characterised by congestion and high population density.
Let’s make paper birds! The more colour we use, the more beautiful our birds will look.
The evaporation of seawater provides an excellent opportunity for coastal countries to produce salt.
The continental climate zone is characterised by four seasons: hot summer, cold winter and two transitional seasons in between.
A cuboid is a polyhedron with six rectangular faces.