... The shape and size of microplastics often resemble natural (organic and inorganic) particles, but their behavior, effects on organisms, and sorption properties may differ (Beckingham and Ghosh, 2017;Mueller et al., 2020b;Wang and Wang, 2018b). Microplastics fate and behavior was compared with other particles in 3% of all studies (Table S3), mostly with natural particles such as kaolin (Ateia et al., 2020b;Gorokhova et al., 2020;Ogonowski et al., 2016;Scherer et al., 2020;Schür et al., 2020;Zimmermann et al., 2020), natural aquatic sediment (Bartonitz et al., 2020;Besson et al., 2020;Harris and Carrington, 2020;Wang and Wang, 2018b), silica particles (Mueller et al., 2020b;Straub et al., 2017), cobblestones (Miao et al., 2020;Miao et al., 2019b), wood particles (Beckingham and Ghosh, 2017), coal (Beckingham and Ghosh, 2017), sandy loam (Leads et al., 2019), diatomite (Scherer et al., 2017), rock , leaves and beech sawdust (Kalčíková et al., 2020). Some studies compared microplastics with other types of particles, such as glass beads (Parrish and Fahrenfeld, 2019;Schrank et al., 2019), cotton fibres (Cesa et al., 2020;Treilles et al., 2020), wool fibres (Treilles et al., 2020), biochar (Beckingham and Ghosh, 2017), and cellulose . ...