I Had Found Again And Again That

A Species Consists Of A Group Of Populations Which Replace Each Other Geographically Or Ecologically And Of Which The Neighboring Ones Integrate Or Hybridise Wherever They Are In Contact Or Which Are Potentially Capable Of Doing So (with One Or More Of The Populations) In Those Cases Where Contact Is Prevented By Geographical Or Ecological Barriers.

As A Consequence, Geneticists Described Evolution Simply As A Change In Gene Frequencies In Populations, Totally Ignoring The Fact That Evolution Consists Of The Two Simultaneous But Quite Separate Phenomena Of Adaptation And Diversification.

Biology Can Be Divided Into The Study Of Proximate Causes, The Study Of The Physiological Sciences (broadly Conceived), And Into The Study Of Ultimate (evolutionary) Causes, The Subject Of Natural History.

The History Of Science Knows Scores Of Instances Where An Investigator Was In The Possession Of All The Important Facts For A New Theory But Simply Failed To Ask The Right Questions.

Anyone Who Writes About "darwin's Theory Of Evolutionin The Singular, Without Segregating The Theories Of Gradual Evolution, Common Descent, Speciation, And The Mechanism Of Natural Selection, Will Be Quite Unable To Discuss The Subject Competently.