Answer:
Recommended timing and recommended rates (assuming correct)
Explanation:
It may mean adding manure or compost to enrich the soil structure. 
 
        
             
        
        
        
There are more than simply 4 biological compounds in the human body. I suppose to categorise, the question is hinting towards the molecules like Carbohydrates ( Poly and mono saccharides ) Proteins ( Polypeptides Made of amino acids) and Fats. There is also water, but I'm hesitant to class that as a biological compound, as it's not organic. 
        
             
        
        
        
Answer:
B. Carbohydrates provide energy for living things.
Explanation:
 
        
                    
             
        
        
        
Answer:
7.8 Billion, but to round it...t is 8 Billion
Explanation:
This is the question to search up. I don't think anyone but the internet knows how many people exist...if you understand.