Answer:
Daphnia is an ideal system for studying multiple stressors because of its short generation time, well-studied ecology and evolutionary history, wide geographical distribution across many limnetic systems, high mutation and recombination rates, high sensitivity to changes in environmental conditions, unique cyclical
Explanation:
 
        
             
        
        
        
Whelp, it is definitely not D. 
I would say B.
there was no Paleogene period.
        
             
        
        
        
Observation is broken up into three parts. The first is the date. Then you have the activity and last you have a brief description of what is being observed.
        
             
        
        
        
The second one I think .............
        
             
        
        
        
I’m definitely gonna say the first choice. The others don’t make much sense