I’m just going to say this once, for the record.
RNA is genetic material. It is replicable and holds code which produces proteins which make up an organism. In the case of plants, it is 100% of what does this. In every cell of a tree are RNA molecules.
In the case of animals, every cell also has another type of molecule, DNA. DNA is two strands of RNA attached to eachother.
Mammal reproduction happens by sperm and ovarian cells, which experience a splitting of their DNA strands into RNA to reattatch to the split RNA strand of the other cell. These DNA molecules form cells around themselves, and replicate other molecules which generate new cells. All of these cells can also contain whatever native RNA existed in the host organism. Any active RNA in the sperm and ovarian cells at the moment of reproduction can also replicate, and form part of the newly generated cells.
In animals, protein creation happens when either DNA split into RNA strands, or native RNA strands, attract enzymes to their extremities that bind into proteins. What is known as mRNA, or messenger RNA, is a strand of RNA that has been split from a DNA molecule.
When a foreign RNA molecule is introduced into the cell, it can functionally be called mRNA if it performs the same functions as actual mRNA, split from a DNA molecule, but is in fact more like a native RNA molecule in essence.
In the vaccines that use mRNA technology, the introduced RNA molecules are said to be self-terminating, that is, it is said that they self-terminate after imitating the function of an mRNA mollecule. This is possible, but it is not innate in the function of RNA. A molecule of RNA introduced into a cell has no need to self-terminate. This mechanism would have to be chemically built-in. In other words, maybe they self-terminate, or maybe they don’t, and can be passed on to new cells and eventually new organisms via sperm or ovarian cells.