1. For a(n) ecosystem to be healthy, it has to have lots of different kinds of plants and animals. 2. Name four types of ecosystems from those listed in the video. A. B. C. D. 3. Describe what Bill Nye was trying to demonstrate by removing some of the blocks in his tower of blocks. 4. All living things depend on . 5. Name at least two species that have gone extinct. (four were shown) 6. The best way to wipe out a species is to . 7. The largest ecosystem in the world is , where 2/3 of all species live. 8. List five things you can do to increase biodiversity. A. B. C. D. E. 9. Of the 30,000,000 species on Earth, how many are lost each HOUR? 10. In conclusion, Bill Nye states that "As more and more species disappear, it's harder and harder to keep an ecosystem in balance because we don't know WHAT?

4. food, shelter and water

5. Sabre-toothed Cat and Woolly Mammoth

6. food and water resources

7. World Ocean

9. 3 specie

Explanation:

All living things depend on their environment that supply food, shelter and water that is necessary for their survival. Sabre-toothed Cat and Woolly Mammoth are the two species that have gone extinct due to unfavourable environmental condition. The best way to wipe out a species is to remove food and water resources. The largest ecosystem in the world is World Ocean where two third of all species live. Of the 30,000,000 species on Earth, three species are lost each hour. In conclusion, Bill Nye states that "As more and more species disappear, it's harder and harder to keep an ecosystem in balance because every specie in the ecosystem balances other specie.

the most speciallized is b. grizzly bear