I believe your answer is 2200000000000000. I hope this can help you :)
Carbon dioxide from the atmosphere dissolves in the surface waters of the ocean. Some of the carbon dioxide stays as dissolved gas, but much of it gets turned into other things. Photosynthesis by tiny marine plants (phytoplankton) in the sunlit surface waters turns the carbon into organic matte
They are about 4.5 billion years old. Hope this helps.
Cathode Ray experiment to figure out electrons exist -> atoms can be broken up into subatomic particles
