Maximum ozone concentration is
One part per hundred
One part per thousand
One part per million
One part per billion
It’s obvious.
Give differences: Heliophytes and Sciophytes
Species are considered as
Which one of the following is not a matching pair of certain organism(s) and the kind of association?
When births are equal to deaths. It is called
$5^{\text {th }}$ $June$ is celebrated as
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