Which among these 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. zoo 3. Which is an example of abiotic factor? A. animals B. decomposers C. plants D. temperature 4. Which is NOT a type of coral reef? A. atoll B. barrier reef C. fringing reef D. lagoon 5. What makes up a coral reef A. algae B. limestone C. rocks D. Sand 6. How can mangrove plants tolerate salt water? A. They do not absorb salt water. B. They use salt and water to make food. C. Their bark is made up of self-proof material. D. They filter salt from the water using their roots.
