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phosphorus is a component of
is phosphorus a major component of bone
phosphorus is a major component of protein
is phosphorus a component of bones and teeth
phosphorus is usually a what
what is the element of phosphorus
a molecule of phosphorus is
is phosphorus a chemical
what kind of element is phosphorus
is phosphorus a element
what type of element is phosphorus
phosphorus is contained in
is phosphorus a compound
what is phosphorus in biology
is phosphorus a compound or element
what is phosphorus in nature
what is phosphorus classified as
what does phosphorus exist as
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