MCQOPTIONS
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				| 1. | 
                                    The given graph represents how three different living organisms (X, Y and Z) cope with the external environmental conditions. Study the graph and select the correct option regarding X, Y and Z. | 
                            
| A. | X could be a mammal. | 
| B. | Y could be a bird. | 
| C. | Z could be a mammal. | 
| D. | X could be a bird. | 
| Answer» C. Z could be a mammal. | |