Properly identifying each species.
Accurately recording his findings.
Not interfering with ecosystem while studying the birds.
        
                    
             
        
        
        
Answer: Inhibition of Mitosis
Explanation: docetaxel, inhibit the microtubule structures within the cell. Microtubules are part of the cell's apparatus for dividing and replicating itself. Inhibition of these structures ultimately results in cell death.
 
        
             
        
        
        
Eukaryotic cells are cells that have a nucleus, while prokaryotic cells do not.
        
             
        
        
        
Black death, also known as the bubonic plague was one of the worst pandemics that ever happened, killing around 1/3 of Europe's population. It spread to Europe in the mid 1300's from China.
Black death victims were treated through magic, witchcraft, prayer and other methods. As for the two other options, they used medicine, but not antibiotics and radiation hadn't been discovered yet (it was discovered in the 1900's)