Mitochondria
Buffalos
Shelves
cargoes or cargos
sheep, it doesn't change.
The plural of activity of activities.
Children or kids
Crises -- pronounced krahy- - seez
no it does not have a mitochondrion
oxen - eg. a team of oxen pulled the plough
Successes is the plural form of the noun success.
A mitochondrion has two membranes.
The Kreb's Cycle occurs in the mitochondria or mitochondrion