Answer:scientific progress pwedeng ma-hinder kapag different countries may iba-ibang units kasi iba-iba yung readings, calculations nagcaconfuse, errors sa data, tapos mahirap mag-collab or compare results. Parang naglalakad kayo sa ibang direction kaya bumagal progress. Kaya unified units (like SI units) important para smooth ang research, study, at sharing ng info sa global scale.