True, the four features formed by wave deposition are beaches, spits, sandbars, and barriers beaches.
        
             
        
        
        
The number of producers is more than consumers and top carnivores in ecosystem. for example:- in the food chain of grass--goat--man,atleast 90% of energy is pasted to other level and 10% will be stored at that level it self. 
        grass                 goat                   man
       50/100               40/80                30/60.
as we human beings depend on plants and animals for our food for our whole life we need atleast 100 numbers of small plants for one week.