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People living in and around the Amazon rain forest

have used parts of the gaviola tree to prepare

medicines. Research is being conducted to

determine if this tree can provide cures for many

types of cancer. Continued destruction of rain

forests might

(1) reduce biodiversity and remove organisms

with the potential to help humans

(2) increase biodiversity and remove damaged

and diseased trees

(3) reduce biodiversity and increase the

reproductive rates of all organisms

(4) increase biodiversity and ecosystem stability

where humans plant crops