11.
Atmospheric content of CO2 is

12.
Green house effect is warming due to

13.
Ecology of individual species and its population including the effect of other organisms and environmental conditions on every stage of life cycle, is known as

14.
Those species whose populations have been seriously depleted and whose ultimate security is not assured are known as

15.
The term biosphere is used for a zone containing living beings

16.
Smog is produced due to

17.
Goitre is an enlargement of

18.
The most adundant element in the body of organisms and outside environment is

19.
Carbon-dioxide content of atmosphere has increased in the past 150 years from

20.
In an unbalanced, skewed, distribution which measure of central tendency is least biased?

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