C. Answer the following questions very briefly. 1. Name the four realms of the Earth. 2. What is an ecosystem? 3. Give the importance of troposphere. 4. Define water cycle. 5. How are oceans useful to humans? D. Answer the following questions briefly. 1. What is the difference between natural environment and human environment? 2. What is atmosphere? 3. Define lithosphere. 4. How is biosphere important for the sustenance of human life? 5. What is hydrosphere?
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