They could compete for the same food resource or actually hunt the native bird, therefore decreasing the population of the Native bird species.
        
             
        
        
        
Answer:
They form crystals. 
They have higher enthalpies of fusion and vaporization than molecular compounds.
They are hard.
They are brittle.
Explanation:
 
        
             
        
        
        
Answer:by rotation that is powered by the motive force
Explanation: