Answer:
B. Is the answer. They are losing their habitat and therefore will be more likely to go extinct 
 
        
                    
             
        
        
        
Answer:alveoli; lactiferous ducts
Explanation:
 
        
             
        
        
        
The answer is B. in the soil
        
             
        
        
        
Answer:
While doing medical research on the human subject, following limitations are unavoidable:
a). Privacy: The privacy of the subject involved in the research should be maintained.
b). the subject must be allowed to the minimal exposure to risks and it must be tested on animals first to avoid deaths.
c). The risk associated with the physiological and physical well being of the subject must be considered.
d). The subject must be well instructed about all the risk and procedure involved in the research.
 
        
                    
             
        
        
        
By examining the tree bark and recording it’s properties. I would note if the cells move and duplicate, I would also note any living organisms which lay on the surface