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Because although there is evidence to support the claims, it isn't possible to prove evolution indefinately.
\that the animals can be found all around the world fossils
Scientists did not prove things then anymore than they prove things now. Evidence, masses of converging evidence support the theory of evolution by natural selection. Darwin, in his day, had much evidence to support his theory. All the way from artificial selection to island biogeography. Since that time the theory has moved on to where it is no longer just Darwin's theory, but modified and supported with so much evidence that the theory became the bedrock of biology. Go here. talkorigins.org
Molecular genetics
Better features, thus involving better adaptation to the environment, for plants and animals.
There is no proven theory of evolution only the physical evidence of what Chuck Norris has allowed to live.
Because due to Darwins theory of evolution, fossils lead to adaptations over time therefor giving us reason to find evolution within human beings and animals.
hard core
Molecular genetics
The theory predicts that evolution will happen and in certain ways. The observed evolution makes this prediction correct. It also defines evolution as happening, and as such is perfect evidence in support of it.
Because although there is evidence to support the claims, it isn't possible to prove evolution indefinately.
\that the animals can be found all around the world fossils
There is strong support for the theory of evolution due to fossils that have been found by archeologists. The fossil records show evidence of evolution over billions of years.
I do not so much " believe it " as I an convinced by the myriad lines of converging evidences that support the theory of evolution by natural selection. talkorigins.org
Scientists did not prove things then anymore than they prove things now. Evidence, masses of converging evidence support the theory of evolution by natural selection. Darwin, in his day, had much evidence to support his theory. All the way from artificial selection to island biogeography. Since that time the theory has moved on to where it is no longer just Darwin's theory, but modified and supported with so much evidence that the theory became the bedrock of biology. Go here. talkorigins.org
Molecular genetics
It is not so much the climate, but it is the tectonic plates movement, and fossils of extincted animals on different continents that support this theory. Also, fossils support the theory of evolution that was proven by Charles Darwin.