It is fine to hypothesize that similarities between different creatures are the result of common ancestry, but since such similarities have been and are often conflicting when compared with other features, it might be prudent to hold back a little when making conclusions about any sort of definite taxonomic classification model or even relationship.
The conclusions that are drawn from the evidence are often and have often been very much exaggerated to fit personal beliefs and biases.
Taking isolated similarities by themselves, the theory of evolution appears to be quite reasonable... However, it seems that too much weight has been placed on similarities without questioning the differences.
To the embarrassment of many a very intelligent man and woman of science, overly confident conclusions and arrogant statements have been made based on such similarities that have, on occasion, turned out to be not only wrong, but painfully wrong.
Of course, the argument is that many scientists of the day did not think too much of Piltdown Man since many did not think that the cranium and the jaw were from the same creature.
But still, it is interesting to note that no one suspected the hoax despite "close inspection" of the specimen for almost 40 years.
So, some caution might be in order before even long established theories are accepted as the "gospel truth", especially when some of the most famous scientists in the field start to question their own life's work.
In considering the theory of human evolution it is interesting to note that some very well known scientists have actually suggested that the line of human evolution is far from clear.
No one, not even a scientist, likes to see a theory that has cost a great deal of money and much of one's personal time and effort, go up in smoke.
Three months before her death, she said in an interview, "All these trees of life with their branches of our ancestors, that's a lot of nonsense." Biases are of course part of human nature. Dawson found a mandible and a small piece of a skull in a gravel pit near Piltdown England.
The jawbone was ape-like but the teeth had human characteristics. These two specimens were combined to form dawn man, which was supposedly 500,000 years old.
Cook and made famous by Henry Osborn of the American Museum of Natural History.
There was an attempt to use this tooth at the Scopes "monkey" trial in 1925 as evidence of the animal ancestry of man.