Dinosaurs first appeared on earth 245 million years ago on a continent called Pangaea (this continent was actually made up of all of todays modern continents.). By the end of the Paleozoic period, 245 million years ago, reptiles ruled on land and fish in the sea, but they...
Pacific salmon are colonizing Atlantic waters off Argentina, posing a serious threat to penguins and other native wildlife that compete for food, experts say.
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