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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
Molecular genetics
Better features, thus involving better adaptation to the environment, for plants and animals.
Evolution is a theory because even though scientists have found a lot of evidence to support it, many other people tend to disagree with it, being opinionated or religious reasons.
hard core
The vast majority of scientists support evolution. There is no longer any debate in the scientific community about whether evolution occurs, only the mechanisms in which evolution acts upon is debated.
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.
Molecular genetics
Because although there is evidence to support the claims, it isn't possible to prove evolution indefinately.
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.
\that the animals can be found all around the world fossils
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
Molecular genetics
Evolution of humans and bacteria plus some animals eg)primates.
Better features, thus involving better adaptation to the environment, for plants and animals.
Evidence of past glaciations have nothing to do with evolution except to show that the Earth is much older than 10,000 years old.