The respiratory system works with the digestive and circulatory systems to make cellular respiration possible. During cellular respiration, your cells use oxygen and glucose to release energy. Carbon dioxide is a waste product of the process. Carbon dioxide must be removed from cells.
Info from: Google lolz. 
 
        
             
        
        
        
An icon is a symbolic representation of an action to be taken, given in emails or message bars. Icons are metaphorical representations of emotions and feelings which a human is unable to explain in words.
The icon used to represent an attachment is paper clip.
When we click this paper clip icon, it allows us to attach any file including a document or a picture in that particular email. An attachment may also contain a virus, Trojans, worms and other form of malware.
  
 
        
                    
             
        
        
        
Answer:
The component of water potential due to the hydrostatic pressure that is exerted on water in a cell. ... In turgid plant cells it usually has a positive value as the entry of water causes the protoplast to push against the cell wall (see turgor).
 
        
                    
             
        
        
        
A biotic factor is a living thing that has an impact on another population of living things or on the environment. Abiotic factors do the same thing, but they are non-living. Together, biotic and abiotic factors make up an ecosystem. To survive, biotic factors need abiotic factors.