Biology: EVOLUTION
Darwin’s evolution theory explains how we have traced life and our bodily structures from our ancestors. The birds, fishes, flowers or bananas they all are interrelated to each other. The evolution theory of Darwin lays stress on developments of living beings from non-living beings. He explained how we keep on developing and modifying our bodies and internal organs from one generation to another. In simple words, the complex creatures are eventually evolved from the simple creatures. The mutations in our body are made according to our requirement in order to survive in the modern and changing world.
Natural selection theory
As we all know, human being descends of animals. We have evolved from animals. Our internal organs and process that occurs in our body are far more complex then the process that takes place in the body of an animal. Charles Darwin added something new to the existing theory and introduced the concept of natural selection. According to the process of natural selection, living beings accumulate and preserve minor beneficial genetic mutations. For example: human being used to have a tail and a big appendix inside his body if we go back to the time of our early ancestors but as the generations proceeded, we are born today without a tail and a small appendix that can even be removed and does not harms our body processes at all. There was no use of tail in our body and slowly and gradually mutations occurred and tail disappeared. It is the natural selection processes through which we are able to bring changes in our body. Natural selection is the process through which specie is able to fight better in environment and survive for a long time easily.