For an animal that has been dead for a long time, its DNA molecule cannot be preserved. A stable frozen ground environment can retain DNA material for hundreds of thousands of years. But the knowledge of half-life tells us that the theoretically identifiable upper limit of the age of ancient DNA is only a few million years, which is not long enough to bring us back to the age of dinosaurs.
The only information that can be preserved forever is the information contained in the DNA, and this information must be preserved through continuous reproduction and replication. As long as the chain of biological reproduction is not broken, all its encoded information will be copied to a new DNA molecule before the destruction of the old molecule. In this way, the encoded information of DNA will far exceed its molecular lifespan.
Therefore, the technical settings of Jurassic Park need to be revised scientifically. In the movie, the insects that have sucked the blood of dinosaurs are wrapped in amber and it is impossible to replicate the resurrected dinosaurs through insect residues.
But if we use DHA to prove that the descendants of dinosaurs are modern birds or modern poultry, we can use cloning technology to restore the original appearance of dinosaurs through the DNA information carried by these birds and poultry.
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