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प्रश्न
Fill in the blank:
Primitive man began existence about ______ million years back.
उत्तर
Primitive man began existence about two million years back.
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संबंधित प्रश्न
Define the following:
Birth control
Fill in the blank:
______ is the size of the population in relation to unit area at a given time.
Fill in the blank:
______ is the total number of live births per thousand people per year.
Fill in the blank:
______ is the total number of deaths per thousand people per year.
Our resources cannot keep pace with the ever increasing population. Give three examples in support of this statement.
Give Reasons: Medical discoveries such as antibiotics and vaccinations have indirectly contributed to the sharp rise in human population in the present century.
Differentiate: Immigration and Emigration.
Define the following term:
Population density
