You can boil water to make water vapor. Then when the water vapor cools down again it becomes water again
        
             
        
        
        
Answer:
Sickle cell anemia is caused by a mutation in the gene that tells your body to make the iron-rich compound that makes blood red and enables red blood cells to carry oxygen from your lungs throughout your body (hemoglobin)
Explanation:
 
        
                    
             
        
        
        
The cell wall of plant is made out of polysaccharide( big sugars)
cell wall is a plant made u of a membrane having life and sun ray observation.<span />
        
             
        
        
        
Answer:
A
Explanation:
Less pollution means less greenhouse gasses being emitted. 
  
        
             
        
        
        
Answer;
Cell  
Explanation;
-The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
-Cell is the basic unit and building block of life. It is bound by a cell membrane, and possesses a nucleus which acts as its brain. Arachnoidiscus ehrenbergi  is an example of diatoms which are unicellular, therefore it is a cell.