I believe it is A (Adenine)
        
                    
             
        
        
        
answer: the parent can be a single organism 
explanation:
it only takes one "parent" single celled organism to asexually reproduce through binary fission
it only takes one "parent" multi celled organism to asexually reproduce through fragmentation or budding 
 
        
             
        
        
        
Answer:
D
Explanation:
because the sun is energy
 
        
             
        
        
        
The answer is "B. Marsupials". Marsupials undergo relatively premature births compared to many other species, and although this puts the baby at risk, it lessens the risks for the mother.