Answer:
When carbondioxide gas is emitted from vehicles and industries and goes upward in the atmosphere. The carbondioxide gas combines with the rain water forming an acid called carbonic acid and make the rain acidic. 
When rainfall occurs this acid comes to the ground and ocean and adversely affected the living organisms due to acidic nature. The marine animal's body comprise of shell and skeleton. This skeleton and shell are made from calcium, when acidification of ocean water occurs, the calcium dissolved and the body of animals are destroyed. 
 
        
             
        
        
        
Answer:
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Explanation:
An organism is made up of four levels of organization: cells, tissues, organs, and organ systems. These levels reduce complex anatomical structures into groups; this organization makes the components easier to understand.
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ANSWER:C) farming and hiking
        
                    
             
        
        
        
Answer:
Some important rules of light are:
- the incident ray,normal ray and the reflected ray lie in the same point.
- angle of incidence is equal to angle of reflection<u>.</u>
<u>.The Angle When It Leaves Is Larger Than The Angle When It Hits. The Angle Is Smaller In The Medium That Has The Higher Index Of Refraction.</u>