Looking for an older marine

Foraminifera forams oldr short are single-celled organisms protists with shells or tests a technical term for internal shells. They are abundant as fossils for the last million years. The shells are commonly divided into chambers that are added during growth, though the simplest forms are open tubes or hollow spheres. Depending on the species, the shell may be made of organic compounds, sand grains or other particles cemented together, or crystalline CaCO3 calcite loooking aragonite. Fully grown individuals range in size from about micrometers to almost 20 centimeters long.

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