Some scientists think the molecules for life may have originated from Space.
Panspermia — the theory that microbes transmit life to habitable bodies in space; or the process of such transmission.
Starting in the 1970s, British astronomers Fred Hoyle and Chandra Wickramasinghe rekindled interest in panspermia. They found new evidence, traces of life, in the intervening dust. They also proposed that comets, which are largely made of water-ice, carry bacterial life across galaxies and protect it from radiation damage along the way. One aspect of this research program, that interstellar dust and comets contain organic compounds, has been pursued by others as well. It is now universally accepted that space contains the "ingredients" of life.
There is a big jump from organic molecules to life on earth.
Microspheres: tiny vesicles of organic molecules may have been the first step to cellular organization.
Scientists have found the first multicellular animals that apparently live entirely without oxygen, Loricifera. The creatures reside deep in one of the harshest environments on earth: the Mediterranean Ocean's L'Atalante basin, which contains salt brine so dense that it doesn't mix with the oxygen-containing waters above. The creature's cells apparently lack mitochondria, the organelles that use oxygen to power a cell. Instead they are rich in what seem to be hydrogenosomes, organelles that can do a similar job in anaerobic (or oxygen free) environments. The find could help scientists understand what life might have looked like in the earth's early oceans, which also had very little oxygen.
A bone is found with 12.5% carbon 14 atoms and 87.5% nitrogen 14 (a stable atom) the T 1/2 for carbon 14 is 5,600 years. If the ratio of carbon 14 to Nitrogen 14 was 100% to 0% at the time the animal was alive how old is the fossil now?
Hint: :How much C14 will be left after 5,600 years?
Using relative and absolute dating methods, paleontologists have created a geologic time scale from the layers of sedimentary rock.
Relative Dating of rock layers and fossils/environments: Which rocks and fossils are the oldest? Why?