Answer:
Oceanic crust is denser than continental crust. At a subduction zone, the oceanic crust usually sinks into the mantle beneath lighter continental crust. (Sometimes, oceanic crust may grow so old and that dense that it collapses and spontaneously forms a subduction zone, scientists think.)
Explanation:
 
        
             
        
        
        
All living things have DNA within their cells
So Yes
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Answer:
objective lenses
Explanation:
objective lenses with different magnifications, screwed into a circular "nosepiece" which may be rotated to select the required lens.
 
        
             
        
        
        
A common way that humans pollute water is through the addition of nutrients (fertilizers and sewage) to water as nonpoint source pollution. These added materials are full of nitrogen and phosphorus, two nutrients that encourage the growth of aquatic producers, such as algae.
 
        
             
        
        
        
The type of energy transfers in which would warm the atmosphere would be the convection,conduction as well as the radiation. The earth's atmosphere which is a thin layer that is being wrapped in a planet. The atmosphere is divided into 4 layers.