In the world Earth the sulfur isotopic composition was determined by the Sunlight. Even though it was assumed that the distribution of different sulfur isotopes could well be kind of equivalent, it's been found that proportions of the two most plentiful sulfur isotopes 32S and 34S varies in several samples. https://judahloxih.thenerdsblog.com/41713189/detailed-notes-on-sulphur-crested-cockatoo-scientific-name