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Evolution of Man

Evolution of Man

Unbelievable but true is the miracle of life.Nobody is certain when life began, but the first fossil sea animals date back about six hundred million years ago. It was another two hundred million years later that vertebrates evolved on land shaped like amphibians, who were air–breathing fish which had begun to modify their fins into primitive legs. Today the dominant forms of terrestrial life are mammals rather than reptiles. The key to adaptation is the concept to govern the environment for survival.

The formation of Life

Formation of Life

The formation of earth dating back a billion years from a large mass as goes the Big Bang theory is really exciting. The universal forces resulted in formation of orbits in which earth and other planets revolved around the sun. After a few million years when water actually formed from the environmental gases (H2 AND O2) first forms of Life called–protoplasm appeared. The basis of life is 4 elements, viz, earth, water, wind and fire simply put, but actually C(Carbon), O(Oxygen), H(Hydrogen) and N(Nitrogen) are what were the constituents of protoplasm which came together and combined under perfect atmospheric conditions to evolve Life. Although another theory states that C, H and N were the constituents of Protoplasm with the ability to combine with O2 (oxygen) and oxidize themselves. These unicellular organisms evolved into multi–cellular organisms and aquatic animals, that is when (fish were formed). They turned into amphibians, then into dinosaurs and finally into various other species.

Mammals and their characteristics

Mammals characteristics

Mammals succeeded the reptiles as the dominant form of animal life on surface of the earth because they were significantly better adapted due to limbs.Major characteristics of mammals is warm–bloodedness (maintenance of relatively high and stable body temperature) Along with warm–bloodedness goes evolution of efficient insulation in the form of hair, fur or layer of fat deposits. Also teeth for mastication and most of all mammals ceased to lay eggs instead gave birth to young ones (viviparous). This was the most efficient mode of reproduction and made the mammals take better care of their offspring. Most important the evolution of intelligent behavior came with mammals. They exhibit curiosity, adaptability, capability of learning from experiencing.

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