46. coral reefs / protect / coastlines / storms and erosion / provide / jobs / local communities / and / offer / opportunities / recreation
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47. they / also / a source / food and medicines / and / over half a billion people / depend / reefs / food, income, and protection
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48. unfortunately / coral reef ecosystems / severely threatened / some threats / natural / others /
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___________________________________________________________________________________ caused / human activities / including / pollution / and / unsustainable fishing practices
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49. many threats / lead / coral bleaching / and / possible death
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50. students / aware / the need / protect coral reef ecosystems/ and / they / help / protect / coral reefs / the world / small actions
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