Question

Take
three
test-tubes.
Fill
3/4th
of
each
with
water.


Label
them
A,
B
and
C.
Keep
a
snail
in
test-tube
A,
a


water
plant
in
test-tube
B
and
in
C,
keep
snail
and

plant
both.
Which
test-tube
would
have
the
highest


concentration
of
CO2?​

Answer 1

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