The answer is C. RNA, but it should really by called mRNA for Messenger RNA 
        
                    
             
        
        
        
Answer: The function of this cell is to take food to other cells
Explanation:
The collar cells have a sticky, funnel shaped collar and a hairlike whip, called a flagellum. The collar cells serve two purposes. First, they beat their flagella back and forth to force water through the sponge. ... Another type of cell, called an amebocyte, takes the food to other cells within the sponge.
 
        
             
        
        
        
Answer:
In biological terms, a leaf is considered to be an organ. An organ is made up of group of tissues which work together. The leaf is also made up of group of tissues which work together.
The leaf comprises of :
- The epidermis tissue which make up the surface of the leaves.
- The mesophyll tissues where most of the chloroplasts are present. Chloroplasts are the site where photosynthesis occurs.
- The leaf also comprises of the vascular tissues i.e xylem and phloem. The xylem and phloem allow transport of water and materials. 
On this basis, a leaf is considered to be an organ.