World Geography
The major cause of species extinction is

development (human settlements, industry)
habitat loss and degradation
extraction (including mining, fishing, logging)
agricultural activities

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World Geography
The sidereal month may be defined as

the period in which the moon completes an orbit around the Earth and returns to the same position in the sky
None of these
the period in which the moon completes an orbit around the earth
the period of rotation of moon

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