The answer is that they do not live on or in the body of a host.
        
                    
             
        
        
        
I think it’s D............
        
                    
             
        
        
        
LOCAL ENVIRONMENT ISSUE:
People dump a lot of trash in the sea, and the sea creatures living there goes through a lot of trouble to live with all the muck getting in them. Of course, don't write it like that in your assignment - you'll get told off for the straight forwardness.
        
             
        
        
        
A is the correct answer to the question
        
             
        
        
        
Answer:
B and D
Explanation:
Biodiversity comes from having multiple types of organisms. This also allows different organisms to eat and create nutrients that is needed by all other organisms in the ecosystem.