The shells of which of the following zooplankton groups are used in carbon-14 dating of ocean sediments?

W) Polycistina

X) Foraminifera [fuh-ram-uh-NIF-er-uh]

Y) Acantheria [uh-kan-THUH-ree-uh]

Z) Ciliata [sil-ee-AY-tuh]
X) FORAMIINFERA