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.
The mitochondrion (singular), mitochondria (plural).
It is both a singular or plural noun.
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.