Crossword Puzzle Useful and harmful animalsOnline version Show wich animals are useful and wich are harmful for humans by Claudette Cristina Ibanez Coll 1 colors or patterns that hide an animal against its background 2 living things that live on or inside other living things 3 poisonous 4 a small biting fly that feeds on blood 5 when a plant or animal is suited to the conditions in which it lives 6 the normal place in which a living thing makes its home 7 an infectious disease transmitted by the Anopheles mosquito 8 long area of low ground, often around a river, that cuts through higher ground on either side 9 a habitat with very little rainfall and no permanent source of water 10 a hard material that forms underwater reefs-made by aimals called polyps 6 10 2 5 9 8 7 1 4