In a recent study in 2015 the scientists found remains of biotic life in a few historic rocks, Western Australia, which dated back to 4.1 billion years ago and on July, 2016 the scientists confirmed about 355 genes which were from LUCA of all the living organisms on Earth.
Formation, change and loss of species through the evolutionary antiquity of life on Earth are validated by common sets of biochemical and morphological traits, plus shared DNA sequences. These common individualities are like species which share a recent common ancestor and can be used to rebuild a biological tree of life centered on radical connection with the help of fossils and species which still exist. The records from fossils comprise of progress from a biogenic graphite to microbial mat fossils to multicellular organisms. The prevailing arrays of biodiversity have been designed by extinction and speciation. Almost 99% of species which have roamed planet Earth are expected to be extinct. There have been about 10 to 14 million variety of species on Earth and 1.2 million only have been documented.
