The alien parasite hypothesis online dating sms africa online dating
Biological evolution is a process of descent with modification.
Lineages of organisms change through generations; diversity arises because the lineages that descend from common ancestors diverge through time.
A detailed discussion of the life and thought of Charles Darwin is found in the article Darwin, Charles.
…centre of the theory of evolution as proposed by Charles Darwin and Alfred Russell Wallace were the concepts of variation and natural selection.
Believe it or not, you can directly access over 1300 articles from this site on this page. The dropdown menus to the left contains all the pages, listed by topic and subtopic.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co.
Paleontologists have recovered and studied the fossil remains of many thousands of organisms that lived in the past.
This fossil record shows that many kinds of extinct organisms were very different in form from any now living.
The virtually infinite variations on life are the fruit of the evolutionary process.Evolution, theory in biology postulating that the various types of plants, animals, and other living things on Earth have their origin in other preexisting types and that the distinguishable differences are due to modifications in successive generations.The theory of evolution is one of the fundamental keystones of modern biological theory. More than 2 million existing species of organisms have been named and described; many more remain to be discovered—from 10 million to 30 million, according to some estimates.The earliest fossils resemble microorganisms such as bacteria and cyanobacteria (blue-green algae); the oldest of these fossils appear in rocks 3.5 billion years old ( Precambrian time).The oldest known animal fossils, about 700 million years old, come from the so-called Ediacara fauna, small wormlike creatures with soft bodies.