Answer:
Offspring of a horse and donkey are unable to reproduce.
Explanation:
The biological concept of species states that:
A species is a group of organism with similar characteristics, that can interbreed and have a fertile offspring. 
Horse + donkey = mule. A mule is a hybrid and is not fertile. 
 
        
             
        
        
        
Id hav to go with A,reason i say that is, synthetic is man made..so it could b altered at anytime
        
                    
             
        
        
        
Answer:
It would be difficult to find the ideal CO2 level with a low light intensity because the plant will have a difficult time trying to survive.
Explanation: