The direct source of energy to move the sailboat is probably wind, since wind is what pushes the sail of the sailboat, which is what propels the sailboat forward. 
Hope this helps!
        
             
        
        
        
Answer:
c.16J
Explanation:
because kinetic energy =1/2mv²
1/2 ×2×4²=16J
 
        
             
        
        
        
Two examples of how the biosphere supports life is by reducing the amount of harmful radiation to reach the surface of the earth. It also gives oxygen for animals to breathe
        
                    
             
        
        
        
Potassium holds an important function in both cell and energy-related functions. Potassium is considered to be one of the important blood minerals. Potassium regulates the balance of both water and acid in our blood and body tissues. Food which are high in potassium include white beans, spinach, plain yogurt, broccoli, sweet potato milk, bacon, oranges and many more. One should avoid the excessive intake of salt because too much intake of salt in the body may cause complications or illnesses in our body. Some illnesses caused by too much salt in the body are fluid retention, high blood pressure, Kidney problems and heart failure.
        
             
        
        
        
Answer:
To maintain stability.
Explanation:
It is important to protect networks of ecosystems and habitats in order to get healthy and stable environment because the environment depends on ecosystems and habitats. If there is no ecosystem or habitat is destroyed then the whole ecosystem will greatly damaged that leads to the extinction of many animals that maintain stability in the environment. Swift fox (Vulpes velox)  and Bison (Bison bison athabascae) are the two species that can be protected by protecting habitat and ecosystem.