People cut off the fins for shark fin soup., many sharks drown., People use rats to test new products., many rats become sick and die., People take turtles' eggs to sell in markets., fewer sea turtles are born in each year., People destroy bamboo forests., there is not enough bamboo for pandas to eat, People use bluefin tunas to make sushi., there are very few bluefin tunas left in the sea..

Therefore

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