With all due respect, gravity can certainly be demonstrated in a lab, as can most other scientific discoveries. Re-creating evolution in a lab cannot be done. As for the “transformational fossils” - no, as such, they do not exist. If, in fact, a completely different species is “born” through adaptation, fossils demonstrating this gradual change should exist. To my knowledge, they do not. Having fossils which supposedly demonstrate an earlier form of man, and then - oops, a later form of man - is not transitional. Furthermore, all the charts and “fossils”, dating, etc... are based on Darwin’s THEORY - and, as such, should not be taught as provable fact in a classroom (i.e. science). That is my point and I stand by it.
The existence of gravity can be demonstrated in the lab, just as the existence of evolution can be demonstrated by measuring endogenous retroviruses.
But the analogy to "Re-creating evolution" is creating a significant gravitational anomaly (without using megatons of mass) - hasn't been done, because we know even less about gravitational theory than evolutionary theory.
Correct in that the exact sequence of events where an environment led to selective pressure on the genetic variation of a population cannot be recreated.
But evolution can be done in the lab. Many thousands of experiments on selective pressure have demonstrated the principles of the theory of evolution through natural selection.
Also like a forensic Science, the past can be seen (through a prism darkly) in the relics of our past that DNA contains like old retroviral infections from when we shared ancestors with other species, and identical mutations in genes not under selective pressure (vitamin C synthase Gulo gene), and a pattern of similarity and divergence such that the relationship of species can be discerned.
Moreover the idea that you have that something is missing in the fossil record is only correct in that a lot of things are missing. What is there shows that what species inhabit the earth has been a varied and changing thing in our long and storied past. It seems that you are looking for some sort of clean line of demarcation, something that you will not see in nature- when you walk from a forest into a marsh there isn't a clean line of separation, the forest just gets marshier and marshier.