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microscopes that do not rely on light to produce images. They are used to study the internal structure of cells and the organelles themselves.
an international agreement to phase out the use of CFCs, signed by 49 countries in Montreal,...
a large tongue-shaped organ in the mammalian body which secretes hormones and digestive enzymes...
the replacement of liver tissue by scar tissue due to damage to liver cells caused by excessive...
the excessive growth of algae in eutrophic streams, rivers and dams.