Answer:
A Elephant eats some grass
A lion rolls in the sand
Explanation:
Elephants and lions are biotic(living), and grass and sand are abiotic (nonliving) and those are two interactions 
 
        
             
        
        
        
I'm thinking true heres why lets say you have a bird and the bird eats worms.. and all the worms in the world are gone the bird will die and what ever animal ate that bird will die and what ever animal ate that bird will die and so on 
my guess
        
                    
             
        
        
        
The primary benefit of folic acid is that it helps in preventing neural tube defects. Folic acid also known as Vitamin B9 are used as a supplementary vitamins taaken by many pregnant mother in order to develop the baby without deformities. Lacking of Folic acid causes neural tube defects define as an irregularities of the brain and spinal cord during the first week of prenancy