Answer:
cosmic background radiation
Explanation:
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Dogs, no matter what breed they are, they are all of the same species and therefore can breed with each other and create fertile offspring
 
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Answer: (C) The production of tissue-specific proteins. 
Explanation:
  The cell differentiation is the process in which the cell change from one cell place to another place. It basically occur due to the process of gene expression. 
The cell differentiation involve the production of the specific tissue protein known as muscle actin. In cell differentiation, the pluripotent stem cell basically go in the specific differentiation level and then reach in the state of fully differentiation. 
The fully differentiation produced a specific function that the production of the protein. Therefore, option (C) is correct. 
 
        
             
        
        
        
Answer:
sorry i dont know the answer