how does the decrease in number of tiger in a forest affect urban life?
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Answer:
Forests provide most of the oxygen that we breathe by the processing of carbon dioxide by the trees in the forest. In order to remain healthy, the trees cannot live in a vacuum - animal activity distributes seeds, fertilizes plants, disturbs the ground cover so that new seeds can take root, etc. There is a food chain in the forest, starting with bacteria and fungus in the soil, which are consumed by animals, which are eaten by larger animals, up the chain to an apex predator like the tiger, which keeps animals like deer lower down the food chain from reproducing too rapidly, and starving themselves out of the environment, which in turn destroys the forest. You cannot have a healthy ecosystem in a sterile environment, by selectively eliminating one or the other species. The ecosystem operates as a unit, and removing components from that system will echo throughout the system and ultimately cause it to collapse.