What did Darwin base his theory on?

Answer 1

That trough time, a specie of animal, plant, bacteria change.

When a life form reproduces, each of its offspring (babies) is slightly different from its parents because of genetic mutation. Sometimes this mutation may give it an advantage over other individuals of its specie. (e.g.: A giraffe may be born with a longer neck and can reach food higher on trees.) Because of this advantage, the life form that is different (we will call it A) can live longer and has better chances to reproduce. The life form that has not this advantage (we will call it B) will live less longer and will have less chances to reproduce. Because of that, the population of "A" will increase and the population of "B"will decrease. In the end, there will only remain "A".

Answer 2

Observations of the radial adaptation of finches, the geographical distribution of closely related species, and the effects of artificial selection in the breeding of pigeons and cattle, among other things.

Answer 3

That trough time, a specie of animal, plant, bacteria can change.

When a life form reproduces, one of its"babies" may be different from its parents because of genetic mutation. Sometime, this mutation may give it an advantage over other individuals of its specie. (e.g.: A giraffe has a higher neck and can search food on high trees.) Because of this advantage, the life form that is different (we will call it A) can live longer and has better chances to reproduce. The life form that has not this advantage (we will call it B) will live less longer and will have less chances to reproduce. Because of that, the population of "A" will increase and the population of "B"will decrease. In the end, there will only be "A".

Answer 4

It is generally accepted that Darwin got his inspiration for the Theory of Evolution from The finches on the Galapagos, although he did read the writings of some of the more radical evolutionists of the time.

Answer

Living organisms were suspected by some people to change over time before Charles Darwin went on his famous HMS Beagle Voyage. Some examples of variability within species were already known. Darwin shot off on his HMS Beagle voyage to the Galapagos and noticed the similarity between Galapagos and South American mainland organisms and that similarity was matched with slight differences. Also, from island to island of the Galapagos, there were differences between the organisms. There were many different varieties of bill-shape among the finches, and variations in shell of the Giant Tortoises. The cormorants of the Galapagos are flightless, and the iguanas are marine. Darwin, perhaps bewildered by such variety, wondered whether species were mutable, changeable from an ancestral coloniser. Darwin had read an essay by Malthus on Population and these Population ideas evolved into Darwin's appreciation of the 'Struggle for Life'. Eventually he worked out that the 'Struggle for Life' drove variation. Finches with big bills were successful while eating nuts. Finches with small bills were not successful if eating nuts, but successful if they tried softer foods like insects. Iguanas, on the Galapagos, were successful if marine. Darwin realised that, from a common ancestor, life branched in a 'tree-like' fashion and this idea he cautiously hypothesised with "I think". Darwin realised there was a similarity between how languages changed with time (languages in a language family arise by a common ancestor language - English, German and Dutch all arise from an ancestral Germanic language, all Indian, Greek, Latin and Germanic languages arise from Indo-European) and how life probably changed with time: in a branching fashion from common ancestors.

A wonderful insight of Darwin (in a world ignorant of hereditary mechanisms, a world knowledgeless of Mendelian genetics or DNA) was how some sort of selection (Darwin called it Artificial Selection) could shape and mutate and sculpt living organisms. Pigeons had been, domesticatedly, warped into the Burmingham Roller and the Pouter and many others. Dogs had been twisted, by selective breeding, into Pugs and Dachshunds, Dobermans, Dalmations, Alsations and Maltese Poodles. Darwin thought it probable that, in Nature, in a natural environment, the "Struggle for Life" effectively bred successful organisms, the death of organisms with attributes that did not allow them to survive effectively 'selected' for the success of organisms that had attributes that did allow them to survive. In other words, what survives is what can survive due to its physiological or behavioural or anatomical attributes, and what does not survive could not survive. Those organisms that have beneficial attributes leave more offspring, reproduce more successfully and so, those organisms with survival-possible attributes multiply successfully in an environment. The 'selection' (analogous to Artificial Selection) of survival-possible organisms, the attributes to survive at least until reproductive age, Darwin called Natural Selection.

Answer 5

Charles Darwin collected his evidence for the theory of evolution by means of natural selection during the second round-the-world survey expedition of the HMS Beagle in the 1830's. This voyage lasted five years. He collected evidence in Argentina, South America and the Galapagos Islands among other places.

Answer 6

It is based on the theory that man at one time evolved from a simpiler life form into what we are today.

Answer 7

Numerous detailed observations of natural life made during an around-the-world voyage on the HMS Beagle in the late 1830's, as well as around the British isles.

Answer 8

darwin based his ideas of evolution on :fossils,geography ,embryology and anatomy

Answer 9

evolution of all living things