Diatoms are common fresh water and marine organisms that are important photosynthesizers and a main primary producer in the global ecosystem.
(Diatoms; are; common fresh water and marine organisms) (marine organisms; are; important photosynthesizers and a main primary producer in the global ecosystem)
Diatoms marine organisms
are are
common fresh water and marine organisms
important photosynthesizers and a main primary producer in the global ecosystem