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Fragile ecosystems cover:

[A].	The arid and semi-arid zones of the world, arid savannas of the tropics, the slopes of the mountains of the tropics	[B].	And subtropics and forest areas of the developing world under shifting cultivation have been described as 'Fragile Ecosystems'
[C].	Because their equilibrium appears to be easily upset and because they become ecologically degraded if certain forms of land use	[D].	All of the above

Answer: Option D