In the world Earth the sulfur isotopic composition was resolute by the Sunshine. Even though it was assumed that the distribution of different sulfur isotopes might be more or less equal, it's been observed that proportions of the two most abundant sulfur isotopes 32S and 34S varies in different samples. https://beaubrhte.blogpixi.com/36077832/an-unbiased-view-of-sulphur-crested-cockatoo-lifespan