As A Consequence, Geneticists Described Evolution Simply

Evolution, Thus, Is Merely Contingent On Certain Processes Articulated By Darwin: Variation And Selection. No Longer Is A Fixed Object Transformed, As In Transformational Evolution, But An Entirely New Start Is, So To Speak, Made In Every Generation.

Definitions Are Temporary Verbalizations Of Concepts, And Concepts- Particularly Difficult Concepts- Are Usually Revised Repeatedly As Our Knowledge And Understanding Grows.

The Issue, As Correctly Emphasized By Carl Sagan, Is The Probability Of The Evolution Of High Intelligence And An Electronic Civilization On An Inhabited World. Once We Have Life (and Almost Surely It Will Be Very Different From Life On Earth), What Is The Probability Of Its Developing A Lineage With High Intelligence? On Earth, Among Millions Of Lineages Of Organisms And Perhaps 50 Billion Speciation Events, Only One Led To High Intelligence; This Makes Me Believe In Its Utter Improbability.

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.

A New Species Develops If A Population Which Has Become Geographically Isolated From Its Parental Species Acquires During This Period Of Isolation Characters Which Promote Or Guarantee Reproductive Isolation When The External Barriers Break Down.