It still puzzles the science world why some mammals produce their you闂佺偨鍎婚懙褰掑焵椤掑﹥瀚�查看更多

 

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It still puzzles the science world why some mammals produce their young ______ and hatching while
others _____ to young babies.     
[     ]

A. lying eggs; giving birth            
B. by laying eggs; by giving birth  
C. by laying eggs; give birth            
D. laying eggs; giving birth

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It still puzzles the science world why some mammals produce their young ______ and hatching while others _____ to young babies.

  A. lying eggs; giving birth          B. by laying eggs; by giving birth

C. by laying eggs; give birth         D. laying eggs; giving birth

 

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