Explanation:
option D is the correct answer ..
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23, half of the total. This is because a zygote receives 23 from the mother and 23 from the father. 
        
             
        
        
        
Answer: The plant becomes self-sufficient when leaves grow onto it.
Explanation: The leaves will start photosynthesis instead of the Cotyledons providing nourishment for the seed.
 
        
             
        
        
        
Answer:
They need backups.
Explanation:
If the organism only has one food source they will use up that resource and eventually the organism will deplete due to lack of food.