Answer:
a is perpendicular to c will be the answer.
 
        
             
        
        
        
Answer : (D)
Explanation: Just as we communicate to each other to initiate a response, cells must also communicate. Of the 7 characteristics of life the characteristic that states a living things respond to their environment most closely relates why cell communication is important and it evolved 
 
        
             
        
        
        
Here are two Eukaryotic cells Plant and Animal
 
        
        
        
i would say D. ! :) let me know if this is correct 
 
        
             
        
        
        
In physical geography<span>, a </span>dune<span> is a </span>hill<span> of loose </span>sand<span> built by </span>wind<span> or the flow of water.</span><span> Dunes occur in different shapes and sizes, formed by interaction with the flow of air or water. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind. The valley or trough between dunes is called a </span>slack<span>. A "dune field" is an area covered by extensive sand dunes. Dunes occur, for example, in some </span>deserts<span> and along some coasts.</span>