Fill in the Blanks (Reading & Writing)

Citizen science projects invite members of the public to —assistassist toassist withassisting researchers by collecting data on everything from bird migrations to night-sky brightness. Because volunteers vastly outnumber professional scientists, these projects can —amassamassingamassedamassment far larger datasets than any single laboratory could gather alone. Critics note, however, that data quality can vary —unlessalthoughdespiteunlike results are carefully checked and standardised.