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Olympiad-Science
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Class 4
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Q)
What does the upper layer of heterosphere composed of?
(
a
)
N
i
t
r
o
g
e
n
(
b
)
H
y
d
r
o
g
e
n
(
c
)
H
e
l
i
u
m
(
d
)
O
x
y
g
e
n
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