Meteors Probably Supplied Activated Phosphorus to Early Earth

ATP.

Paper here. This has interesting implications for the von Neumann probe panspermia hypothesis - that is, that there are chemical von Neumann probes (or merely dumb replicators) hitching interstellar rides on small bodies with hyperbolic orbits, and we're a side effect. Consider also that comets delivered most of our water.

Since such a mechanism to build depots for future biochemistry doesn't seem a terribly unlikely occurrence in solar system formation in general, this raises the likelihood of life, but also makes the Fermi paradox (and Great Filter arguments) more exigent.