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the mammalian throat.
barrier made of coral (a living organism consisting of animal and algal tissues) that lies in...
a complex chemical compound that fills the spaces in the cell wall between cellulose, ...
a thin, flexible layer of the plant cell wall inside the middle lamella. It consists mainly of...
blood that has no antigens (blood group O) and can be given to a person with any blood group....
part of the skeleton that occurs in the head which supports the structures of the face and forms...