When soil becomes contaminated by toxic metals, it can be removed from the ground and disposed of in a landfill. ________ contaminated soil can be detoxified via phytoremediation: plants that can withstand high concentrations of metals absorb the pollutants and store them in their shoots, which are then cut off and safely disposed of, preserving the health of the plants.
Which choice completes the text with the most logical transition?
Difficulty: Hard
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