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correct answer on a sheet of paper. 1. Which of the following is an example of a natural ecosystem? A dam B. grassland C. subdivision D. wheat field 2. Which of these is NOT an artificial ecosystem? A. corn field B. dam C. swamp D. 200 3. Which is an example of an abiotic factor in an ecosystem? A. animals B. decomposers C. plants D. temperature 4. This is the top part of a rainforest. A canopy B. floor C. subcanopy D. understory 5. What is the main reason for the diminishing rainforest area in the Philippines? A. climate change B. deforestation C. dynamite fishing D. erosion 6. Which is NOT a type of coral reef? A. atoll B. barrier reef C. fringing reef D. lagoon 7. Coral reefs are made up of A. algae B. limestone C. rocks D. sand 8. Which of these is called the "rain forest of the sea"? A. beach B. coral reef C. estuary D. lagoon 9. How can mangrove plants tolerate saltwater? They A. do not absorb saltwater B. use salt and water to make food C. bark is made of salt-proof material D. filter salt from the water using their roots 10. Which is NOT a function of mangrove roots? A. filter sea water build up shorelines C. absorb and store salt from the water D. remove impurities and pollutants from water
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