Answer: Biomass 
Biomass produces gas or many sorts of waste products which are mostly used in burning and cooking. It is plant or animal material used as fuel to produce electricity or heat. Examples are wood, energy crops, and waste from forests, yards, or farms. 
But the reason why it can be harmful is because biomass can produce gases like methane. Methane is a  greenhouse gas which can harm the environment and reduce the ozone layer that stops harmful UV light from reaching the earth atmosphere.
 
        
             
        
        
        
Answer:
helps ecosystem
Explanation:
provides oxygen, clear water and air, water treatment and the list goes on
 
        
             
        
        
        
Plants that use photosynthesis would
        
                    
             
        
        
        
Yes, since B and C will be pushing towards each other, it will form a mountain.
        
             
        
        
        
A cell surface protein is a proteins that is embedded in or span the layer of cell membranes of more complex organisms. These proteins are integral to the way in which a cell interacts with the environment around it, including other cells.