Question

bioremediation and ________ remediation are the two types of remediation that can treat contaminated groundwater in an aquifer.
a microbial
b physical
c chemical
d thermal

Explanation:

Bioremediation uses biological (microbial) processes to treat contamination. The primary paired category for groundwater remediation alongside bioremediation is chemical remediation, which uses chemical agents to neutralize or remove contaminants from aquifers. The other options do not form the standard paired classification here.

Answer:

c. Chemical