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Tardigrades can survive in extreme environments, they can even stay alive in outer space.
Marine mammals, the largest known animals to have ever existed.
The American bison is the largest land animal in North America.
Based on their life cycle, insects can be grouped into three categories: ametabolous,...
Moles are small subterranean mammals with modified, spade-like forelegs.
The archaeopteryx shows characteristics of both birds and reptiles. It is probably the...
A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary...
The ancestors of Arachnida and Crustacea belonged to the class Trilobita.