Crossword Puzzle IMPORTANT WORDSOnline version deducción de vocablos by marisa degenova 1 Adjective related to the natural conditions. 2 The action of polluting. 3 All plants, animals and people in an area and their relationships. 4 Animals and plants living in natural conditions. 5 A structure with a roof and walls. 6 The quality of being acid. 7 Unhealthy condition caused by an infection or disorder. 8 A covering on a surface. 9 Likely to cause harm. 10 Combination of substances. 11 The top covering of the Earth where plants grow. 11 2 8 7 4 6 3 5 10 9