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We act like animals, we eat like animals, and we are animals. The many theories of evolution such as Darwin's theory of evolution prove to us that we choose to believe that we are not animals when we really are. Evolution is the sequencial process of change over periods of time, which shapes and establishes the formation of modern man.

In referring to evolution, the word means various changes. Evolution refers to the fabrication and development of life on earth. "Organic evolution" is the concept that all living beings evolved from simple organisms and have changed throughout the periods of time to create many and various types of species. Organic evolution is better known as the "theory of evolution." There are three main theories of evolution, which are, the early theories proposed by Comte de Buffon, Baron Cuvier, and Lamarck, the synthetic theory, and the Darwin theory.

In the 1700s, French naturalists, Comte de Buffon and Baron Cuvier concluded with the studies of fossils and comparative anatomy that life on earth had endured many changes through a long period of time. In the early 1800s, another French naturalist named Lamark, proposed the first complete theory of evolution. He observed through is observations, depending on the extent to which the use of the structure, that an animal's body structure is able to change during its life span. He also noted that organs and muscles, which were used often, tended to become larger and stronger. On the contrary, the organs and muscles, which were used seldom, tended to become smaller and diminish. With these observations, Lamarck concluded that these characteristics were hereditary.

Proposed during two decades, the 1930s and 1940s, the synthetic theory involved a group of scientists. The group of scientists included two American biologists, Russian Theodosius and German Ernst Mayr, and the British geneticist and statistician Ronald A. Fisher. Together, they proposed the synthetic theory which combined Darwin's theory of natural selection with the ideals of genetics.

In 1808, French naturalist Chevalier de Lamarck contemplated a theory of evolution, although, his theory of evolution did not gain any recognition until 1858. In 1858, British naturalist Charles R. Darwin furnished his theory of evolution, also known as Darwin's theory. Along with Darwin's theory of evolution there early theories and the synthetic theory. In 1858, Charles Darwin furnished his theory of evolution and the majority of scientists accept the Darwin theory today. The Darwin theory states that all species evolved from either many or few common ancestors or descendants under circumstances of natural selection. Three chief resources aided Darwin to develop his widespread theory of evolution. One, his personal observations, two, the geological theory of British scientist Sir Charles Lyell, and three, the population theory of the British economist Thomas Robert Malthus. Aboard the H.M.S Beagle from 1831 to 1836, Charles Darwin made many of is observations in his quest to propose his theory of evolution. On the coast of South America, Darwin came under the possession of many specimens of plants and animals. On the Galapagos Islands, off the coast of Ecuador Darwin discovered many differences between species on the islands and with the species on the mainland. For example, Darwin noted that certain fossils of extinct species were closely similar to living species in the same geographical area. Darwin also observed that each island possessed its own form of tortoise, mockingbird, and finch. He also discovered various forms of these species were closely similar but differed in structure and eating habits from island to island. In addition, Darwin discovered varieties of differences between species on one island and another island. With each observation, Darwin come to the question of possible links between distinct but similar species.

British economist Thomas Robert Malthus aided Darwin in creating the theory of natural selection. Malthus proposed how human populations remain in balance. He debated that any increase in the availability of food for basic human survival could not equal the geometrical rate of population growth. In addition, limitations such as famine, disease, or war, play a major role in deciding the population growth. With this proposal, Darwin quickly applied Malthus's proposal in circumstances of plants and animals. In 1838, Darwin designed a projection of a theory of evolution through natural selection.

Natural selection is a process in which the organisms suited best for their environment tend to reproduce the most and leave the most descendents. With the limitation of