A group of people visited a forest to know about growth of trees and animals. How trees are grown and to know the importance of forests for all human beings. The study on forests are telling all humans to protect for all mankind and to maintain sustainability.1. Why forests need to be sustained?a. To maintain trees and animals effectivelyb. To cut down trees for futurec. To maintain industrial areas after some yearsd. None of the above2. Forests are used for?a. To maintain sustainability in environment.b. To grow more trees.c. To increase oxygen content in air.d. All of the above3. Sustainability of forests increasesa. Oxygen content in airb. Animal life is safec. Protecting treesd. All of the above4. Forests are decreasing. TRUE or FALSE?a. TRUEb. FALSE5. Forests are decreasing due toa. Cutting down treesb. Developing industries in forest areasc. Both A and Bd. None of the above