The Age of Dinosaurs

It is widely believed that dinosaurs ruled the earth some 160 million years ago. Is that true??? Had dinosaurs really existed???? Let's examine it now. Dinosaur is the name of a group of prehistoric reptiles. These animals died out millions of years ago, but they have fascinated people ever since they were first described in the early 1800's. The name dinosaur comes from the term Dinosauria, which means terrible lizards. But dinosaurs were not lizards, only distantly related to them, and most were not very terrible.

For many years, people thought that dinosaurs were clumsy, slow-moving, unintelligent creatures that lived much like modern reptiles. However, fossil evidence suggests that some dinosaurs—especially small theropods—were much more active and intelligent than previously thought. In addition, scientists generally agree that small theropods are the closest known relatives to birds. Thus, scientists can learn much about the life of dinosaurs by studying birds and other modern animals that have some similarity to dinosaurs.

While dinosaurs ruled the land during the Mesozoic Era, many kinds of large reptiles inhabited the sea and air. Sea-dwelling reptiles included ichthyosaurs , which resembled dolphins in shape and probably could swim fast. Mosasaurs enormous sea lizards that lived during the late Cretaceous Period, which ended about 65 million years ago. They grew up to 30 feet long. Plesiosaurs had four large flippers and a short tail. Many plesiosaurs also had an extremely long neck.

Flying reptiles called pterosaurs became the first vertebrates to evolve flapping flight, the kind of flight later used by most birds. Each of a pterosaur's wings consisted of a membrane of skin supported by a long finger made of hollow bones. Pterosaurs had no feathers, but hairlike structures probably covered their bodies. Some pterosaurs ranked as the largest flying animals of all time, reaching a wingspan of 40 feet .

Theory of Nature!

Nature, in the broadest sense, is equivalent to the natural world, physical universe, material world or material universe. "Nature" refers to the phenomena of the physical world, and also to life in general. Manufactured objects and human interaction generally are not considered part of nature unless qualified in ways such as "human nature" or "the whole of nature". Nature is generally distinguished from the supernatural. It ranges in scale from the subatomic to the galactic.

The word nature is derived from the Latin word natura, or "the course of things, natural character." was a Latin translation of the Greek word physis , which originally related to the intrinsic characteristics that plants, animals, and other features of the world develop of their own accord. This is shown in the first written use of the word , in connection with a plant. The concept of nature as a whole, the physical universe, is one of several expansions of the original notion; it began with certain core applications of the word φύσις by pre-Socratic philosophers, and has steadily gained currency ever since. This usage was confirmed during the advent of modern scientific method in the last several centuries.

Within the various uses of the word today, "nature" may refer to the general realm of various types of living plants and animals, and in some cases to the processes associated with inanimate objects – the way that particular types of things exist and change of their own accord, such as the weather and geology of the Earth, and the matter and energy of which all these things are composed. It is often taken to mean the "natural environment" or wilderness – wild animals, rocks, forest, beaches, and in general those things that have not been substantially altered by human intervention, or which persist despite human intervention.

This more traditional concept of natural things which can still be found today implies a distinction between the natural and the artificial, with the latter being understood as that which has been brought into being by a human consciousness or a human mind. The Nature has gifted us with Lovely Mountains, Deep Blue Ocean, Snow Peaks, Untouchable Sky, Greenish Meadows and lots more.... The gift of Nature should be preserved to the best for a better life on Earth...