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4-WE PROTECT ECOSYSTEMS-N.S-4TH

 4-1-WHAT ARE AQUATIC ECOSYSTEMS?

pag.64-65




4-2-WHAT ARE TERRESTRIAL ECOSYSTEMS?

pag.66-67




4-3-WHAT IS BIODIVERSITY?

pag.68-69




4-4-HOW CAN WE LOOK AFTER ECOSYSTEMS?

pag.70-71



4-5-THE GREAT BARRIER REEF



4-6-PROJECT:MAKE AN ECOSYSTEM