Are you joking: a policeman is a human being, not an (chemical) element (as known in the Periodic Table)
ativated B cells forms effector cells which are called plasma cells
blood cells, white blood cells, sperm cells, brain cells.
All plant cells are eukaryotic cells
Animal cells have lysosomes, plant cells don't. Plant cells have a cell wall made out of cellulose, animal cells don't. Animal cells have many small vacuoles, plant cells have one large vacuole. Plant cells have chloroplasts and chlorophyll, animal cells don't. Animal cells have centrioles, plant cells don't.
policeman's
A Policeman is a Police Officer that is male.
What degree do you need to be a policeman?
A posse of policeman
Policeman is a noun.
The duration of The Policeman is 1.45 hours.
policeman, fireman
The Third Policeman was created in 1967.
Policeman Bluejay was created in 1907.
The New Policeman was created in 2005.
The Unfortunate Policeman was created in 1905.
The Traffic Policeman was created in 1960.