Describe how scientists are trying to make Plastics less harmful
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By making things able to be recycled more often, people are creating biodegradable plastic products which break down much quicker compared to regular plastics that will last longer than our lifetime, reusing plastics is basically recycling but actually making it into a whole other product in order to prevent that plastic from going to yet another landfill, I can't think of anything else right now but I hope this helps

b. lithosphere, asthenosphere, mesosphere   is the answer most likely