Answer:
The motion of an object is determined by the sum of the forces acting on it; if the total force on the object is not zero, its motion will change. The greater the mass of the object, the greater the force needed to achieve the same change in motion. For any given object, a larger force causes a larger change in motion.
Explanation:
 
        
                    
             
        
        
        
Maybe that if they stop swimming they won’t die? Not sure if that’s helpful but it’s a suggestion. Here’s a link about sharks-https://g.co/kgs/jVvFkF
        
             
        
        
        
Answer:
Mitochondria
 Explanation: Mitochondria are oblong shaped organelles found in the cytoplasm of all eukaryotic cells. In plant cells, they break down carbohydrate and sugar molecules to provide energy, particularly when light isn't available for the chloroplasts to produce energy.
 
        
             
        
        
        
1) - C) Algae growing on the glass
2) - A) Bacteria that lives in the intestine of a rabbit
3) - D) All the gray squirrels that live in a forest
4) - D) Density
Hope this helps!