Answer:
According to scientists , water occupies up to 60 % of the human body .
The importance of water in the human body are ;
- Transport 
- Formation of bodily fluids i.e. saliva 
- Digestion 
- Regulates body temperatures 
- Circulation of nutrients 
Explanation:
The reason why it is important to maintain good fluid balance within and without he cells is because , It can dissolve various elements to make then easily absorbed into other system .There are many fluids which rely on water for volume e.g. blood which is the main component of the circulatory systems , water also regulates the temperature  and heart pressure , 
Through electrolysis , fluid balance in the cells can be achieved and it also helps to generate nerve impulses  .
 
        
             
        
        
        
Answer:
A spade placed in the fire turns hot.
Explanation:
 
        
             
        
        
        
A. Metabolism this is the process of taking food and making it energy
        
                    
             
        
        
        
nebular hypothesis
The most widely accepted theory of planetary formation, known as the nebular hypothesis, maintains that 4.6 billion years ago, the Solar System formed from the gravitational collapse of a giant molecular cloud which was light years across. Several stars, including the Sun, formed within the collapsing cloud.
 
        
                    
             
        
        
        
Answer:
d. Character displacement
Explanation:
Character displacement is the phenomenon in which the similar species living in the same geographical region with similar niches differentiate in order to reduce their niche overlap and avoid competitive exculsion. Just like in this case of two- spot and three -spot avenger beetles as their timmings for hunting is different where their ranges overlap. So it's the good example of character displacement,