brain or nervous system cells are called as neurons
 
        
             
        
        
        
Answer:
1-Mouth:the mechanical digestion takes place in mouth with the help of teeth. chewing is the machanical digestion of food in mouth.
2-Stomach: by the churning process. churning is the mixing of food in stomach by the movements of smooth muscles in stomach wall.
Explanation:
 
        
             
        
        
        
Answer:
Alveoli are tiny, balloon-shaped air sacs. Their job is to move oxygen and carbon dioxide (CO2) molecules into and out of your bloodstream.
Explanation:
 
        
             
        
        
        
The intermembrane space (the space between the outer and inner membranes), the inner mitochondrial <span>membrane, the cristae space (formed by infoldings of the inner membrane), and. the matrix (space within the inner membrane).</span>
        
                    
             
        
        
        
C. Phloem carries the sugars to all parts of the plant for proper growth and energy. 
Reason: The primary components of vascular tissue are the Xylem and the Phloem.
These two tissues transport fluid and nutrients internally.