All the observed universe has contributed to life.
This paper presents evidence that virtually all electrons and nuclei of the atoms that are or have been part of living matter on Earth came from almost all stars in our and nearby galaxies and even from all other galaxies in the Universe that have produced observed high-energy gamma rays. However, a standard 70 kg human is always making about 7 3He, 600 40Ca, and 3000 14N nuclei every second by radioactive decay of 3H, 40K, and 14C, respectively.
Davies
R E
RE
Department of Animal Biology, University of Pennsylvania, Philadelphia 19104-6046.
Koch
R H
RH
D000818:Animals; D055580:Astronomical Phenomena; D001256:Astronomy; D001695:Biology; D055598:Chemical Phenomena; D002621:Chemistry; D006801:Humans; D016082:Solar System