Human evolution, Science

Human Evolution:

Charles Darwin in  the 'Origin of Species' gave a lilechanism for the evolution of  plants and animals in general, even  though he had speculated about the origin of man. Four years later, he published  the "Descent of Man",  in which he speculated that like other animals, man too had evolved form pre-existing  living forms. Darwin was greatly impressed by  the similarities in  the bodily structure of man and thegreat African apes, the Chimpanzee and the Gorilla.

From this, he speculated on the location of man's origins. In his own words, "In each great region of  the world, the living mammals are closely related to the extinct species of  the same region.  It  is, therefore, probable that Africa was formerly inhabited by extinct apes, closely allied tothe gorilla and chimpanzee; and as these two species are now man's nearest allies, it is somewhat more than probable, that our early ancestors lived on the African  continent than elsewhere". Darwin had noted that embryos, i.e.  early unborn young ones, of  different organisms pass through very similar stages. However, small alterations in the timings of  events in early development might produce a substantial change in the mature organism; for example in many ways adult humans are like juvenile apes,  their small faces and globular cranium bones enclosing the brain  are indicative of  this.

 

953_Human Evolution.png

A  crucial step in human evolution, enlargement of  the brain, can be seen as a result of  the slowing down of  development  in the embryo of  an ape-like ancestor. Instead of stopping at birth, brain growth continues well  into childhood, eventually producing a much larger and more complicated piece of  mental machinery. 

Posted Date: 9/28/2012 3:36:31 AM | Location : United States







Related Discussions:- Human evolution, Assignment Help, Ask Question on Human evolution, Get Answer, Expert's Help, Human evolution Discussions

Write discussion on Human evolution
Your posts are moderated
Related Questions
Define Unicellular Organisms and Multicellular Organisms You may be aware that some organisms are made up of only one cell, while others have more than one cell. Well, the sing

does giraffes have short necks?

Define Procedure for Estimation of Iron in the Solution? Carry out the experiment following the steps enumerated herewith: 1. Weigh 702 mg of reagent grade ferrous ammonium

Explain Transport - Functions of Plasma Proteins Hormones and several other small molecules travelling in the plasma would themselves get filtered in the renal glomeruli and ge

Vitamin E  (Tocopherols) Vitamin E is an essential fat-soluble vitamin that functions, at  least in part, as a lipid- soluble antioxidant. Presence of vitamin E was first revea


how is metal tyre fitted on the wheel of bullock cart

A field trip to a rock quarry The quarry should be visited by the teacher in advance. View how the rock is removed. If the rock is sedimentary, view the layers. Collect rock sa

why we cannot see air

A model illustrating how an eclipse appears The sun is shown by an opal electric bulb shining by a circular hole 5 cm in diameter in a piece of blackened cardboard. The corona