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A savanna is a grassy plain in the tropical and subtropical regions with few trees. Savanna's are usually covered with grass and found in hot countries especially in Africa. Savannas are generally flat and cover 20% of the Earth's land surface.
The environment is the circumstances and conditions that surround us. It involves the complex physical, chemical and biological factors like climate, soil and living things that act upon an organism or an ecological community that ultimately determine its form and its survival. In short the environment is the surroundings or conditions in which a person or animal lives and operates.