simply not possible at all. DNA breaks down quickly, like within 20-40 yrs. So we may have animals that seem preserved but the dna is not. They tried to piece the Tasmanian tigers dna back together but failed. And that’s only been extinct a matter of decades. The dna also goes hand in hand with the egg cell. The egg cell that goes with that animal provides the machinery to decode the dna. Imagine you had a computer operating system but the computer that could read it no longer existed. So you need at least a closely related animal egg cell & intact dna
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