amoeba - amoebae (amoebas is also acceptable)
bacterium - bacteria
datum - data
deer - deer
criterion - criteria
cactus - cacti
formula - formulae
forum - fora (forums is also acceptable)
hippopotamus - hippopotami
medium - Media
amoeba - amoebae (amoebas is also acceptable)
bacterium - bacteria
datum - data
deer - deer
criterion - criteria
cactus - cacti
formula - formulae
forum - fora (forums is also acceptable)
hippopotamus - hippopotami
medium - Media