I wonder what scientist would find before and after the consecration of the bread and wine .
Reason informed by faith reveals the Eucharist to be the body and blood of Jesus.
Not possessing this knowledge, pretty much everyone would see it as a wafer of bread.
A person who believes matter (not in the A/T sense, but the modern definition) to be the fundamental reality of all things would probably call it a collection of molecules. If we apply sufficient heat to it, we get carbon dioxide and water and heat as it burns. From there, with measurements of the original compound and the products we can deduce that it was made of glucose. There would be no difference between the bread and the Eucharist once we destroy what it is and reduce it to the simple bits of information that are atoms.
But the same thing applies to us; there is no difference in the chemicals present in a living person or cadaver. The physiology of a living organism (the activity found in a heart or kidney) can also be reproduced outside of the person in a lab. But you and I are something different than just the simple processes that are necessary for life. We perceive, think, feel and act as one being; but once we die, we change. Our bodies which now influence the expression of these capacities as components in our relational nature, break down as a result of the inherent properties of matter freed from the organizational principle that was the human spirit, previously one with the body.
NonChristians would not see any difference between a piece of bread and the Eucharist. A materialist would do likewise, as they would see no substantial difference between an ape and a person.
The Eucharist may be said to be created at the time of consecration, utilizing the material present in the bread. One substance is destroyed and another created.
Now this idea might be carried over to the creation of the first man, such that a hominid egg was made human. Of course this would require a direct creative act by God. It could not come about through the properties inherent in matter alone. They spontaneously and randomly do not organize themselves into the complexity found in even the simplest organisms, let alone give them life. However, God does not need to do this, and perhaps more easily, Adam could have been brought into existence in adult form.
Understanding is a work in progress.