Answer:
so that you would know what views are on each side and the shape of the describes that we are outside the earth surrounded by water 
 
        
             
        
        
        
1. constant speed is a steady speed from start to finish, instantaneous is not constant from start to finish.
2. The average speed of the marble is 5 m/s  (meters per second). 
3. Rider 1 will arrive at the destination before Rider 2.
Hope This Helps!  : )
 
        
             
        
        
        
Its autotrophs, they are the first level of the food pyrimid