Heart disease affects the cardiovascular system by plaque building up on the artery walls narrowing them making it harder for blood to flow through which could lead to heart attack or probably stroke if the plaque blocks it entirely or maybe almost entirely. 
Heart disease may also affect our nervous system for there is higher risk to stroke and it is due to limited flow of blood to the brain and may lead to heart failure which may happen with heart disease that puts the stress on the brain and nerves. 
The digestive system is affected by heart disease that causes the system to not get the right amount of oxygen and the nutrients that it needs from the blood.
        
             
        
        
        
It's an important part of the bird's ability to maintain its body temperature.  
Air is a poor conductor of heat, so the air trapped among the feathers 
prevents the loss of heat in cold atmosphere, and prevents overheating 
in hot atmosphere.  Much like our wearing several layers of clothing.   
        
                    
             
        
        
        
Answer:
Ocean covers most 0f the planet's surface and contain nearly all its water.
Explanation:
The ocean is a constant form of salt-water that incorporates more than 70 percent of the Earth's exterior. Ocean courses command the world's climate and shake a kaleidoscope of experience. ... Smaller ocean domains such as the  Gulf of Mexico, Mediterranean Sea, and the Bay of Bengal have recognized seas, gulfs, and bays.
 
        
                    
             
        
        
        
Animals ( or plants ) store solar energy as chemical energy between atoms of their molecules. 
For example : ATP is phosphate energy bonds stored by animals in their molecules. 
For more stable form animals also store energy in carbon bonds called carbohydrates. The most common e carbohydrates are starch, sugar and fats. Animals have enzymes to convert these forms of energy into actual form which they use for their activities like move, run or fly.