Threatened is the definition used when describing a species at risk of extinction
        
                    
             
        
        
        
Answer: population density
Explanation:
 
        
             
        
        
        
the answer is B :) youre welcome 
 
        
                    
             
        
        
        
Answer:
the branch of biology that deals with phylogenesis
Explanation:
another term for phylogenesis
 
        
                    
             
        
        
        
Answer:
its b 
Explanation:
but I have to make the explanation 20 words so imma write random things down here jdjdnkoskdndhjejsjsoosjssnjdjdjdjso