Next Next Previous Previous


4 5 the Great idea eat, breed, adapt and pass it on In 1859, after over 25 years collecting specimens and studying variations between species, particularly barnacles, Charles Darwin 180982 revealed his theory of evolution by natural selection. It directly contrasted with Lamarcks theory. The fact that offspring vary in their characteristics, suggested Darwin, was enough to allow nature to select in favor of those individuals slightly better suited to perpetually changing environments. Tiny changes, each conferring small advantages, could mount up, over many generations, to produce large differences, even new species. In 1864 Herbert Spencer 18201903 coined the phrase survival of the fittest, attempting to encapsulate this idea. Darwinism usurped Lamarckism, though no one, including Darwin, was yet able to furnish an empirically evidenced explanation for the mechanism that promoted the variation that allowed natural selection to work. Nevertheless, gemmules, his descriptive term for the particles responsible for biological transfer, were, unknown to him at the time, in many respects similar to Mendels pairs page 8. Darwins theory also suggested that man had descended from ancestral apes. A revolutionary concept at the time, his theory of evolution questioned humanitys place in the universe and challenged longheld beliefs about the nature of creation. Above and left Striking similarities between humans and chimpanzees suggested that both were closely related, and that man was a species of ape. No piece of evidence to the contrary has ever been found since, only further support.
From Other Books..
Currently Browsing:
Buy and download E-Book PDF
Buy Softback from Amazon
Buy Hardback from Amazon
Keywords on this page
Show fewer keywords
Show more keywords
See Also:
Log In
Authors List
Series Titles
Special Offers
Powered by Ergonet BookBrowser Engine