Plural of ameba; multiple amoeba organisms, using the regular English plural ending.
From ameba (Greek amoibē 'change') + -s (standard English plural marker). This is the more common English plural compared to the Latinate amebae.
The battle between amebas and amebae shows language evolution in action—English keeps stealing plurals from Latin and Greek, but ordinary speakers prefer simple -s, so Latinate forms are slowly disappearing.
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