sensei writes:
Evidence for common ancestry is very weak.
There are many different sources of evidence for common ancestry, sensei. Not all of them are equally strong, but they all lead to the same conclusion, namely that all life on earth is related. The latest and best evidence we currently have is DNA-sequencing, from which we can infer a very detailed phylogenetic tree. As it happens, this tree corroborates other earlier sources of evidence, such as the fossil record, or embryology, which yield less detailed but largely similar phylogenetic trees. The fact that different methods point to the same result, even before DNA-sequencing, is pretty strong evidence that the conclusion of common descent is warranted.
"Ignorance more frequently begets confidence than does knowledge: it is those who know little, not those who know much, who so positively assert that this or that problem will never be solved by science." - Charles Darwin.
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