Answer:
The brain is part of the Central Nervous system. 
Explanation:
 
        
                    
             
        
        
        
 <span>The hydrologic, rock and tectonic cycles are all interconnected. In the rock cycle, water moves regolith during EROSION, and the tectonic cycle resurfaces rock through UPLIFTING. 
In short, the answer would : erosion, uplifting.
Hope this helps !
Photon</span>
        
                    
             
        
        
        
1.) a mature mushroom drops spores
2.)spores falls on the ground - germinate
3.)they meet compatible spores
4.)mycelium originates - pinheads originate
5.)primordially formation -growth mushrooms drops spore
6.)circles completed
        
             
        
        
        
I think the cytoskeletal protein that helps a cell maintain its shape is actin.