Sixty-five million years ago, the last of the non-avian dinosaurs went extinct. So too did the giant mosasaurs and plesiosaurs in the seas and the pterosaurs in the skies. Plankton, the base of the ocean food chain, took a hard hit. Many families of brachiopods and sea sponges disappeared. The remaining hard-shelled ammonites vanished. Shark diversity shriveled. Most vegetation withered. In all, more than half of the world's species were obliterated.The cause of the mass extinction that marks the end of the Cretaceous (140 million to 65 million years ago) and the beginning of the Palaeogene (65 million to 45 million years ago) is a scientific mystery. The extinction wiped out the dinosaurs while most mammals, turtles, crocodiles, salamanders, and frogs survived. Birds escaped. So did snails, bivalves (oysters, muscles and scallops), sea stars (starfish), and sea urchins. Even hardy plants able to weather climate extremes fared okay.Scientists tend to huddle around one of two hypotheses that may explain the Cretaceous extinction: an extraterrestrial impact, such as an asteroid or comet, or a massive bout of volcanism. Either scenario would have choked the skies with debris that starved the Earth of the sun's energy, throwing a wrench in photosynthesis and sending destruction up and down the food chain. Once the dust settled, greenhouse gases locked in the atmosphere would have caused the temperature to soar, a swift climate swing to topple much of the life that survived the prolonged darkness.The Reptilians had been defeated more than 65 million years ago when they attempted to settle on Earth. The Mandarinni had defeated them on previous occasions and destroyed them; but their technology continued to progress and they scoured the universe for human colonies. 65 million years before the birth of Christ, a meteor crashed through the atmosphere and more than half of the then known species perished.The Mandarinni had started to colonize Earth over 100 million years BC and were in constant battle against the Reptilian forces. The Mandarinni accepted the volcanic conditions of Earth and knew of its possible turbulent nature. The Reptilians had found a planet that served their every need; vast oceans, tropical rain-forests, and vast grass plains. As the Earth developed, they adapted to their surroundings; adapting to their food sources and climate. The Mandarinni had fought the Reptilians on more than one occasion in the far reaches of the universe and had almost been defeated; but went underground and survived. They built their technology to the point where they could once again rid the universe of the scourge of the Reptilians and sought them out. They caught the Reptilians off guard and destroyed their vast fleet; but in doing so, also destroyed the control of their settlements; including Earth. Those Reptilians that remained on Earth had none of the former control as fighters and colonists, and their culture and unity began to break down. They turned on each other and were destroying Earth and its natural development. The Mandarinni colony on Earth suffered because of this rampant destruction and the Supreme Council on Murinottii in the star system of Magmotii, met to decide what they had to do to defeat the Reptilians and return Earth to their people. Many suggestions were offered but one of their junior generals offered a solution of such magnitude, the council laughed; until one of their scientists shouted from the balcony."He is right; our forces cannot defeat them for we are too week; let nature and the forces of the stars do what we cannot."