The scientific theory of evolution was well explained by Charles Darwin when he published "On the origin of species" in 1859. He explained that species evolved when the species faced the pressure due to environment which leads to adaptation which resulted in survival. He called it survival of the fittest.
In evolution, the survival of the fittest due to adaptation has resulted in increasing the variations and complexity of the organism which is supported by the evidence collected by Darwin when he observed that Galapagos finches showed the variations in the shape of the beaks due to different niches.
1) The antibodies destroy the antigen (pathogen) which is then swallowed and digested by macrophages. 2) White blood cells can produce antitoxins which destroy the toxins that are otherwise known as poison.
