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Demmi Wang#107645942Quiz 11. a. The subtitle of this ecology movie: Race to Save the Planet.b. Many species have already become extinct. However, we can’t tell the exact number of species become extinct by humans.2. a. There are at least 30 million species on the planet.b. About 1/3 of the species on the planet have been threaten by human.3.a. Ants make up more than 1/10 of the world’s animal tissue.b. Ants can process vegetation, and help return nutrient to the soil to keepplants survive. In turns, plants absorb carbon dioxide from the atmosphere and replace it with oxygen.