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.
        
             
        
        
        
I think Earth’s atmosphere plus atmosphere. So, 23+48=71. So, the answer is A
        
             
        
        
        
You need to give all the information. if a car is going 100 mph and a train is going 40 mph then the car will get there first. But you need to provide all the information in order to get a valid answer
        
                    
             
        
        
        
Answer:
( A. joints between long bones )
 
 
        
             
        
        
        
the answer is mitochondria