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Tropical rain forests are:

[A].	The most valuable and the richest ecosystems on earth	[B].	They play a critical pat in the earth's life support systems and house 50% and possibly as much as 90% of all the species on earth
[C].	They are a key storehouse of foods, oils and minerals and source of ingredients that make up a range of medical treatments	[D].	All of the above

Answer: Option D