Yes it is both.
Mitochondria is already plural. The singular form is Mitochondrion.Mitochondria IS plural. The single form is mitochondrion.
The word mitochondria is the plural form; the singular noun is mitochondrion.
Mitochondria is the plural word.Mitochondrion is singular form.
That it is. But mitochondria is the plural. Mitochondrion is the singular.
It is both a singular or plural noun.
The mitochondrion (singular), mitochondria (plural).
Yes, the noun sheep is both singular and plural.
The word "ground" can be both singular and plural. Singular: "The ground is wet." Plural: "The grounds of the park are well-maintained."
Fish is both singular and plural.
Epidermis is both singular and plural
"Lens" is both singular and plural.
Fish is both singular and plural.