Senior teacher teaching chemistry Senior teacher standing in classroom, holding test tube, teaching chemistry in elementary school. ,model released, Symbolfoto ,property released Copyright: xZoonar.com/StockLitex 2232346 ,model released, Symbolfoto ,property released

Royalty-Free Standard Commercial licenses are granted for worldwide, non-exclusive and perpetual use, unless specifically noted otherwise. All Royalty-Free transactions are final. The Royalty-Free Standard Commercial license has no limitations and covers up to 15 users.