An educated guess about something. (What might happen in the future)
        
                    
             
        
        
        
The answer is D
Hope this helps
        
             
        
        
        
Option A is the false statement.
Only materials that have never been part of a living thing can be recycled in nature. 
In actual all living and non living thing can be recycled in nature. 
 
        
             
        
        
        
Answer: C- ecosystem 
An ecosystem is a biological community in which living beings interacts with their non-living environment. An ecosystem consists of abiotic ( non-living factors like water, sunlight, wind and soil) and biotic factors such as plants and animals. Ecosystem allows not only the interaction of abiotic and biotic factors but it favors the interaction between the living species. For example animals are dependent upon plants so as to derive their food. The coexistence of organisms favors the diversity of land forms on earth. 
Communities of organisms coexist in organized, balanced ecosystems.