b/c of fossils
Because adaptations are an observed effect of evolution. They could not happen if evolution did not occur.
It would probably be superseded by a thesis founded on more credible scientific evidence.
A classic way to disprove evolution by means of fossils would be to find a fossil rabbit in Pre-Cambrian sedimentary rocks. Of course, that can never happen.
Evolution
Genetic mutation does not always lead to sterilization as you point out. This however is not the way evolution happens. Evolution occurs mainly through small adaptive changes over a long period of time that are not mutations. Evolution does not happen suddenly.
Because adaptations are an observed effect of evolution. They could not happen if evolution did not occur.
Evolution is caused by adaptations (favorable traits) that sometimes come from mutations. Mutations happen by chance, and this is how chance plays a role in evolution.
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.
It would probably be superseded by a thesis founded on more credible scientific evidence.
A classic way to disprove evolution by means of fossils would be to find a fossil rabbit in Pre-Cambrian sedimentary rocks. Of course, that can never happen.
Evolution Worlds happened in 2002.
Trials Evolution happened in 360.
GTR Evolution happened in 2008.
Atlantis Evolution happened in 2004.
Evolution Skateboarding happened in 2002.
Dance Evolution happened in 2010.
Buffers Evolution happened in 1999.