Based on Genomic studies, why do people say that different species and organisms had a common ancestor 100 million years ago.
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By comparing the DNA sequences of different organisms, it has been revealed that all organisms are phylogenetically close. They have a higher DNA sequence similarity than those organisms which are phylogenetically not related.
Genetic fragments like pseudogenes have areas of DNA that are similar to a gene of a related organism but may not be active. It appears to be a steady process of degeneration through cumulative mutations and it also supports common descent.
Also, molecular variance patterns and universal biochemical organization have found the same in many organisms.
That is why people say people say that different species and organisms had a common ancestor 100 million years ago.
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