Answer:
Carbon can form four covalent bonds
Explanation:
 
        
                    
             
        
        
        
Parent rocks.
( I got it wrong when I put Inorganic materials)
 
        
             
        
        
        
Answer:
The definition of a pure line is a result of inbreeding where animals or plants have certain characteristics that are the same through generations. An example of a pure line is the result of inbreeding of a certain flower to help it fight off diseases.
 
        
             
        
        
        
<u>Conservation is the most important strategy in the soil management programs of agriculture</u>
In the soil management various practices are followed which will help to conserve the soil and so as to increase the fertility of the soil. Being the most important step conservation is very mandatory, as the building up of new soil will take a lot of time. It also protects the soil from the bad weather and protects the erosion. In conservation process it helps in the nutrient preservation, which can give good yield when practised cultivation. More crops can be easily grown , which will fetch more money. The conserving soil can also help in biochar fertilizer.
 
        
             
        
        
        
Answer:
Isaac Newton
Explanation:
 Isaac Newton discovered that white light is a spectrum of seven colour rays.