A. the cell theory stating that all living things are composed of cells.
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-Payshence
 
        
             
        
        
        
Answer:
A
Explanation:
This showed that at one point all continents were joined
 
        
             
        
        
        
Answer: A protein's specific shape determines its function.
Explanation: If the three-dimensional structure of the protein is altered because of a change in the structure of the amino acids, the protein becomes denatured and does not perform its function as expected.