Answer: Cellular Respiration and Mass
Explanation: Animals get glucose by breaking down the food they eat, then  during cellular respiration, glucose combines with oxygen to release energy and to form carbon dioxide and water.
 
        
             
        
        
        
It is called jagged gaphene i think
        
             
        
        
        
Answer:
Group 1 - Alkali metals; Group 4 - Elemental Properties 
Explanation:
The elements in Group 1 are called Alkali metals and those are: Lithium, Potassium, Rubidium, Celsium, Francium and Sodium and the elements in Group 4 are called: Titanium, Hafnium, Zirconium and Rutherfoundium. 
It's important that group 4 has no trivial name like the group 1 does, it belongs to the grouping of <em>transition metals </em>and those metals have several general properties. They are found in the middle of the periodic table.   
 
        
             
        
        
        
Answer:
(a) Allow movement in only one plane/direction (that is extension or flexion)
(b) The skeletal system also produces blood cells in their bone marrow
 
        
                    
             
        
        
        
Because the cells can only use energy in form of ATP.
Its like you can't run a diesel truck on petrol.