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Mutualisms, such as those that occur among plants and pollinators, generally involve large numbers o
The tolerance of male lions towards the cubs varies. They are, however, generally more likely to sha
Earthquakes at Divergent Plate Boundaries
Early cities were small economic centers surrounded by walls to keep out enemies. These cities had ...
As cities evolve, so does architecture. This photo is of the Exhibition and Conference Center in ...
Notice the reddish-brown haze caused by nitrogen oxides that is often over many major cities.