Answer: Osteoclasts are the bone cells that break down bone.
Explanation:
 
        
             
        
        
        
The answer is <u>High </u><u>Mountain</u>  <span />
        
             
        
        
        
Answer:
From Red Giant to Supernova: The Evolutionary Path ofHigh Mass Stars. Oncestars that are 5 times or moremassive than our Sun reach the red giant phase, their core temperature increases as carbon atoms are formed from the fusion of helium atoms. ... When the core contains essentially just iron, fusion in the core ceases.
 
        
                    
             
        
        
        
I think that its A. acquiring energy
I hope this helps ^-^
(let me know if im wrong)