After reading the paragraph below, answer the questions that follow.
Plants are sometimes used for phytoremediation in areas where the soil has been contaminated with heavy metals. Suppose the Acme Remediation Company is proposing to remediate a contaminated area that you wish to restore. Acme presents you with the following data as evidence of their company's ability to remediate soil.
What likely caused the loss of metals in the control soil?
◦ being washed away by water draining through the soil
◦ buildup of humus
◦ evaporation of the metal molecules into the air
◦ absorption of the metal molecules by clay particles
Plants
Plants
Plants
Adding additional amounts of ethyl alcohol (ethanol) increases the frequency reading.
Answer
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