Grade 9 Science Exam Review 2014 | Page 13

16. Four ways that humans have an impact on sustainable ecosystems are: 17. a) Biodiversity refers to: b) Biodiversity is important to: 18. An example of an invasive species is _________________ It is an invasive species because it is: 19. An ecological footprint is a: 20. Label the graph below: A Number of Bacteria C B Time (minutes) What limiting factors affect the bacteria population? ____________,_____________ 21. Why has urban sprawl reduced the biodiversity of that area? _____________ What is the solution to urban sprawl? _________________________ Page 13 of 18