Answer:
They fight against infections and disease.
Explanation:
 
        
                    
             
        
        
        
Explanation:
The animals that remain active during the day are called the diurnal while animals that remain active during night are called the nocturnal. 
As per the question we can distinguish organisms and plants and see their behavior during the day as well as during night. Diurnal are organisms that activate during the day, while the organisms that activate during the night are called the nocturnal.  Among the animals, nocturnal animals are bats, mouse, hedgehog, etc. The appearance of the nocturnal animals is due to the following three factors :
-- to avoid heat
-- to hunt 
-- to mate
 
        
             
        
        
        
Answer:proton
For our purposes at this point in the text, we can define an acid. as a substance with at least one hydrogen atom that can dissociate to form an anion and an H + ion (a proton) in aqueous solution, thereby forming an acidic solution.
Explanation: hope it helps!
 
        
             
        
        
        
Answer:
For normal goods, the income effect and the substitution effect both work in the same direction; a decrease in the relative price of the good will increase quantity demanded both because the good is now cheaper than substitute goods, and because the lower price means that consumers have a greater total purchasing power. 
Explanation:
 
        
             
        
        
        
Answer:
About 100 times more than other planets.
Explanation:
The Sun would be about 100 times bigger than the earth planet in the scaled-down model of the solar system because in the reality the size of sun is 109 times more than the earth so making a model more perfect and nearer to reality we have to maintain the diameter of the sun more than 100 times than the earth and other planets.