Acquired Characters Inheritance Theory or Lamarckism - This theory was based on the principle that all the physical changes occurring in an individual during its lifetime are inherited by its offspring.
Natural Selection Theory or Darwinism - Darwinian Theory of Evolution explains that evolution is the result of natural selection, and natural selection is biased by the inherited characters of organisms.
De Vries Neo-Mutation Darwinism's Theory - According to de Vries' mutation theory, living organisms can develop changes to their genes that greatly alter the organism.
Neo-Darwinism - Neo Darwinism relates to the genetic variation only which can be inherited are the responsible forces for speciation.