1. Plant parts infested with plant lice transversal section.
2. Damaged leaves transversal section destroyed epidermis.
3. Damages needles of conifers transversal section.
4. Plant stem, damaged by the game, transversal section.
5. Wood destroyed by fungus.
6. Sikn of fish transversal section, injured by chemicals.
7. Skin ulcer of an amphib transversal section.
8. Human lung with coal dust transversal section.
9. Goiter caused by deficiency of iodine.
10. Gall nut caused by lice transversal section.