The observed rate of change from adult to child is the average amount of mutations per 1000 base pairs of DNA. That is the “observed” change.
It is more than enough to explain the difference in human and chimp DNA (2% genetic 6-10% genomic), if we had a most recent common ancestor some six million years ago.
One need not have all the pieces of the puzzle to see the pattern. That is the very nature of the scientific method and its beauty.
What do we see some 3 million years ago in the fossil record?
Something about what you would expect from a creature that shared a recent common ancestor with chimps only three million years before.
Lucy.
The change from adult to child is not an evolutionary change.
Please understand this. Back to square one. (We need at least a single piece of the puzzle—just one will do for starters.)
Fossils from 3 million years ago suggest discrete species, separated by immense gaps in genetic information. If evolution were true, these gaps would not be there.