---

Size: 4960px × 3320px
Photo credit: © Carsten Rademacher / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: analysing, analysis, attempt, blackboard, chemical, chemielehrer, chemistry, chemstry, children, cobs, diagnosis, examination, examine, fluids, formula, girl, institution, instruction, interior, laboratory, man, maufofi, natural, people, pureline, research, result, schoolgirl, science, scientific, searches, series, teacher, teenager, test, test-tubes, testing, waist, years