World Geography
The major geological events of the Palaeozoic era include

Appalachians and Central European mountains come up
both (a) and (b)
Caledonian mountain rise, life comes ashore
None of these

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World Geography
Which among the following period in the demographic history of India is called the Period of Stable Population?

1951 to 1981
1981 to Present
1891 to 1921
1921 to 1951

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