Quellennachweis Bilder S. 3.1: öbv, Wien; S. 75.1: JenkoAtaman / stock.adobe.com; S. 75.2: Olga Yakovleva / Getty Images - iStockphoto; S. 75.3: Alexey Krukovsky / Getty Images - iStockphoto; S. 75.4: Animaflora / Getty Images - iStockphoto; S. 86.1: MEV-Verlag, Germany Illustrationen: Angelika Citak, Wipperfürth: 7.1; 8.1; 9.1; 13.1; 13.2; 31.1; 35.1; 35.2; 35.3; 37.1; 37.2; 37.3; 37.4; 39.1; 39.2; 39.3; 39.4; 39.5; 40.1; 40.2; 55.1; 55.2; 56.1; 57.1; 57.2; 57.3; 57.4; 59.1; 59.2; 59.3; 59.4; 59.5; 61.1; 64.1; 72.1; 73.1; 73.2; 79.1; 79.2; 79.3; 79.4; 79.5; 80.1; 80.2; 80.3; 81.1; 81.2; 81.3; 82.1; 82.2; 82.3; 82.4; 83.1; 84.1; 84.2; 85.1; 86.2; 87.1; 87.2 DaTex, Leipzig: 18.1; 23.1; 28.1; 83.2; Nur zu Prüfzwecken – Eigentum des Verlags öbv
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