SAT Practice827e0162-2691-4a51-b3c8-11c9f57a2e06
Practice one SAT question at a time
Questions come from the Bluebook question bank.
Known as Earth’s “living skin,” biocrusts are thin layers of soil held together by surface-dwelling microorganisms such as fungi, lichens, and cyanobacteria. Fortifying soil in arid ecosystems against erosion, ______blank
Which choice completes the text so that it conforms to the conventions of Standard English?