Answer
D.Diffraction
Explanation
Diffraction is a property that is experienced by waves when they come across a barrier when they are in motion. 
The ways tends to curve behind the barrier. This is called diffraction of waves.
Now, sound is a wave and it also experience diffraction. . So the brother will be able to hear the sound due to diffraction
 
        
                    
             
        
        
        
Answer:
hey there 
( i )we have to Choose good nutrition. A healthy diet is one of the best weapons you have to fight cardiovascular disease. and should be physically active and stop smoking if you do these are some 
life style changes though which can prevent heart attacks 
( ii )An healthy diet for heart 
lots of fruits and vegetables.
nuts, beans, and legumes.
whole grains.
plant-based oils, such as olive oil.
low-fat dairy products.
Explanation:
Hope it helps you 
have a nice day :)
 
        
             
        
        
        
<span>Energy can be transformed from one type to another in any convection. Some of the energy is lost to the environment as
HEAT.</span>
        
                    
             
        
        
        
I think the correct answer from the choices presented above is the first option. The characteristics of low energy waves are <span>long wavelengths and low frequencies. Energy is established to be indirectly proportional to wavelengths and frequencies.</span>