Spermatozoa
The plural form of rat is 'rats'.
The plural of zoo is zoos. The plural possessive form of zoos is zoos'.
The plural possessive form of lion is lions'.
The plural is fossae.
Spermatozoon.
Spermatozoa
A male sex cell is a spermatozoa, or sperm cell. Sperm are produced in the testes, or testicles, and mixed with nutrients to form semen.
sex cells | gametes ; scientific name ovum, plural ova and sperm is spermatozoa, plural spermatozoon.
I'm not sure about sperm. I think you may mean its full name, spermatozoon (that's quite hard to pronounce, I guess that's why we usually call it 'sperm'). The scientific plural form is spermatozoa. Egg is also called ovum. Its plural form is ova.
Bridges is the plural form of bridge.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
There is no plural form for the word, countries. This word itself is a plural.
"Groceries" is the plural form of "grocery."
The plural form of "meter" is "meters."
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.
It has no plural form.