As we know, many species of organisms are present on earth.

The study of the development of these different varieties of organisms is termed Evolutionary Biology or Bioevolution by Mayr.

Anaximander stated that "Man originated first as fish".

Xenophanes recognized fossils as remnants Of the Organism of the past.

Empedocles stated that "Incomplete & defective forms of organisms gradually perish in nature and are replaced by better ones" and he is known as the "Father of the concept of evolution".

Aristotle recognized "A ladder-like gradation in nature" placing all living things in a hierarchy with the simplest creatures at the bottom and man at the top.