The fossil record says eloquently that profuse evolution had indeed occurred over millions of years, but the data just aren't sensitive enough to analyze evolutionary kinetics. This is the province of the evolutionary geneticist who works with descent and change in populations of present-day organisms.
Evolution itself is accepted by zoologists not because it has been observed to occur or is supported by logically coherent arguments, but because it does fit all the facts of taxonomy, of palaeontology, and of geographical distribution, and because no alternative explanation is credible.
The dominant concept in Aristotle's philosophy of nature is his notion of causation.... The final cause states that each substance has an inherent purpose. Thus there must be a purpose or design in the acorn such that it always grows into an oak tree. This aspect of existence is indicated by the word entelechy; this means the purpose that guides things to develop in one way rather than another.
Ask anyone today working on foundational questions in quantum theory and you are likely to hear that there is still no consensus on many of these questions—all the while, of course, everybody seems to be in perfect agreement on how to apply the quantum formalism when it comes to making experimental predictions.
As in common life he who best knows how to meet the many difficulties and to utilise the various opportunities which life presents is the successful man, so in scientific discovery he is successful who is able to seize upon and rightly understand the meaning of the phenomena which all eyes witness but only those of the seer can interpret.