the nucleus of an ordinary hydrogen atom does not contain any neutron in it. only hydrogen atom contains one electron ;all other atoms contain more than one electron .A hydrogen atom contains only one Proton in its nucleus, atoms of all other elements contain more than one proton.
Photosynthesis by tiny marine plants (phytoplankton) in the sunlit surface waters turns the carbon into organic matter. Many organisms use carbon to make calcium carbonate, a building material of shells and skeletons
