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12.Ecosystem
normal
Phosphorus is major constituent of
$(1)$ Biological membranes
$(2)$ Nucleic acid
$(3)$ Cellular energy transfer system
$(4)$ Protein synthesis
A
All given
B
Both $1$ and $2$
C
$2, 3$ and $4$
D
$1, 2$ and $3$
Solution
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Standard 12
Biology
