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The Waterfall Model was the first Process Model to be introduced. It is very simple to understand and use. In a Waterfall model, each phase must be completed before the next phase can begin and there is no overlapping in the phases.

From tracking Polar bears, Arctic fox, and ringed seal to swimming with sea lions, penguins, whales and seals in the Sea of Cortez, the world is full of incredible wildlife adventures that you need to experience at least once. If you are a sucker for animals, you won't want to miss these unforgettable wildlife vacations. The wonders of nature are spread in the forms of forests, waterfalls, flowering pastures, mountains, rivers and valleys. When wild life enters the beautiful nature, it attracts travelers from far and near. The natural spectrum of wild lands always encourages people to travel the scenic lands. In this way, tourists explore the way to enjoy life from a different angle.