Search results
Results From The WOW.Com Content Network
The giraffe is a large African hoofed mammal belonging to the genus Giraffa.It is the tallest living terrestrial animal and the largest ruminant on Earth.Traditionally, giraffes have been thought of as one species, Giraffa camelopardalis, with nine subspecies.
The northern giraffe (Giraffa camelopardalis), also known as three-horned giraffe, [2] is the type species of giraffe, G. camelopardalis, and is native to North Africa, although alternative taxonomic hypotheses have proposed the northern giraffe as a separate species.
There are approximately 117,000 wild giraffes around the world, per the Giraffe Conservation Foundation.This number has decreased by nearly 30% since the 1980s. Meanwhile, the population of ...
On the Origin of Species (or, more completely, On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life) [3] is a work of scientific literature by Charles Darwin that is considered to be the foundation of evolutionary biology. It was published on 24 November 1859. [4]
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, ...
The southern giraffe (Giraffa giraffa), also known as two-horned giraffe, [1] is a species of giraffe native to Southern Africa. [2]
The four major alternatives to natural selection in the late 19th century were theistic evolution, neo-Lamarckism, orthogenesis, and saltationism. Alternatives supported by biologists at other times included structuralism, Georges Cuvier's teleological but non-evolutionary functionalism, and vitalism.
By his own account, Herbert Spencer described a concept similar to "survival of the fittest" in his 1852 "A Theory of Population". [9] He first used the phrase – after reading Charles Darwin's On the Origin of Species – in his Principles of Biology of 1864 [10] in which he drew parallels between his economic theories and Darwin's biological, evolutionary ones, writing, "This survival of ...