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As for the extinction of the dinosaurs the only solid fact is that no trace of dinosaur has been found after the Cretaceous. This calls for ideas of their sudden disappearance, and a great numbers of theories have been proposed, many of which with a preference for the dramatic. It should be emphasise, however, that there is no reason to think that the dinosaurs disappeared suddenly. And there is neither any reason to think that …

…sea decreased which upset the ecological balance of the sea too: The algae were food for other sea-organisms, which were food for fishes and other see-animals, which also decreased, why the lope-finned fishes and the see-reptiles, ichthyosaurs, plesiosaurs, mesosaurs and others, consequently disappeared. These factors, and surely many others, brought the world of the dinosaurs to an end, leaving a world covered with foliated forests, and the possibility for the small, warm-blooded mammals to evolve.