TRANSPOSABLE ELEMENTS (TEs) “are found in almost all life forms, and the scientific community is still exploring their evolution and their effect on genome evolution. It is unclear whether TEs originated in the last universal common ancestor, arose independently multiple times, or arose once and then spread to other kingdoms by horizontal gene transfer.” (TE = transposable elements, jumping genes).
https://en.m.wikipedia.org/wiki/Transposable_element