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12.Ecosystem
normal
Phosphorus is the major constituent of
$I.$ biological membranes
$II. $ nucleic acids
$III.$ cellular energy
Choose the correct option
A
$Only\; I$
B
$Only \;II$
C
$Only \;III$
D
$All \;of\; these$
Solution

Biological membrane, nucleic acids and cellular energy transfer systems.
Standard 12
Biology