The evolution of the jaw enables creatures to kill, butcher and devour prey; sharks; crocodiles; lions.
Examining the guts creatures use to exploit a variety of ecological niches and food sources; digestive systems shape history.
During the history of life on Earth, sex may rank as the ultimate survival skill because the bottom line for any species is reproduce or die; intercourse among everything from dinosaurs to insects, dinosaurs, pandas and people.
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