INVADERS 1. Do you know what these expressions mean? What is their pronunciation? biosphere homogenization species natural habitats biodiversity hierarchy invasion, invasive menace 2. Read the first two paragraphs and formulate the subtitle for this extract. 3. Do you know some species that have invaded natural habitats of other species? 4. The article deals with various degrees of menace caused by invasive species. Scan the text and say how many levels are mentioned. biosphere homogenization species natural habitats biodiversity hierarchy invasion, invasive menace