Answer:
In order, from least complex to most complex:
cells.
tissues.
organs.
organ systems.
organism.
Explanation:
 
        
             
        
        
        
<span>The surface temperature of white dwarf stars is higher than that of red super giants. White dwarf stars are extremely hot when they form, and they start cooling off as time goes by. Red supergiants, on the other hand, are enormous dying stars, and they are quite cool. So, having this in mind, white dwarves are hotter than red supergiants. Hope I helped! :) Cheers!</span>
        
             
        
        
        
Answer:
Red algae
Explanation:
Coral reefs are the structure which are one of the some most important underwater ecosystems of the world. They are characterized by the formation of roof-building corals which are basically the colonies of dead or living polyps(corals) attached together through deposition of calcium carbonate. 
Red algae has an important role in the formation of coral reefs  because their thread like structure traps the particles present in the sand of water which ultimately gives the algae a mechanical support for their growth as well as the formation of coral reefs.
Hope it helps!
 
        
                    
             
        
        
        
Electrical changed to thermal I’m pretty sure
        
                    
             
        
        
        
Answer:
water and rocks; energy source, break down dead plants and animals, returning vital nutrients to the soil.
Explanation: