Actually, it was Lamarck who earlier introduced the giraffe as an example for evolution - Lamarckian evolution, to be sure. Lamarck proposed that there was some mechanism by which the short-necked ancestors of giraffes could acquire a change such that their offspring would have necks better suited to their needs. Darwin applied natural selection to the same example mainly because it had already been discussed in such detail.
It wasn't exactly that. Darwin believed that species evolved through natural selection. Meaning the individual that's best suited for the environment survives. So for example giraffes. As the food started getting harder and harder to reach only giraffes with longer necks would survive. Hence giraffes have freakishly long necks now
Only the organism with the traits best suited to survive will be able to reproduce and pass on their traits
Darwin was the first scientist to have the courage to put forward the theory of natural selection.
That selection was natural.
That is Darwin's principal of Natural Selection, sometimes called survival of the fittest.
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It wasn't exactly that. Darwin believed that species evolved through natural selection. Meaning the individual that's best suited for the environment survives. So for example giraffes. As the food started getting harder and harder to reach only giraffes with longer necks would survive. Hence giraffes have freakishly long necks now
more babies being born that people dying
Charles Darwin
Modern scientists now use genetics to help explain the theory of natural selections.
Only the organism with the traits best suited to survive will be able to reproduce and pass on their traits
An example similar to the evidence Darwin used to support natural selection is the variation in the beak sizes of Galapagos finches. Darwin observed that the finches' beak sizes varied based on the types of food available on each island, showing how adaptations can lead to differential survival and reproduction, supporting his theory of natural selection.
Lamarck would have said that the ancestors of modern-day giraffes had short necks but stretched their necks as they tried to reach leaves in trees; so, their descendants were born with longer necks. Darwin would have said that in a population of ancestral giraffes, some had slightly longer necks than others; the long-necked giraffes were better able to feed on tree leaves and as a result produced more offspring. Over time, the proportion of longnecked giraffes in the population increased.
Erasmus Darwin was Charles Darwin's poetic grandfather. He was a physician, natural philosopher, and poet known for his work in evolution and natural history.
Darwin
Lamarcks theory was accepted during Darwin's life, stated that an orgnisims use or disuse of an organ lead to its refinment. That parents could pass on traits acquired during its life to its offspring. Darwin stated that changes in offspring were random and could not be modified by the parents actions. Evolution was still the same, changes accumulating over time, but how those changes came about, through the organisim its self, lamark, or randomly Darwin.
Charles Darwin was a naturalist and the author of On the Origin of Species. Darwin believed that species evolved though random mutation, with mutations that caused a beneficial change being more successful than those that caused maladaptive or no change. He called this process "natural selection."Jean-Baptiste Lamarck was a naturalist who believed that creatures could change during their own lifetime, acquiring characteristics in response to changes in the environment, which they could then pass on to their offspring.For example, we know that giraffes have long necks. Lamarck would say that giraffes with shorter necks would stretch high to reach leaves in the tops of trees. This would stretch their necks. Their offspring would then be born with longer necks. Darwin said that short-necked giraffes would have competition with other grazing animals, so giraffes with even a slightly longer neck would be able to eat leaves that antelope and other grazers couldn't reach. These giraffes would be more likely to be well fed and reproduce, and pass their longer necks along to their offspring.We now know that, with some limitations, Darwins theory is corect.