Answer:
your body produces melatonin it is to help you fall asleep
Explanation:
 
        
                    
             
        
        
        
It is A,  the cell is divided into a parent cell and daughter cell (mitosis)
        
                    
             
        
        
        
Phloem is the food conducting tissue that has a two-way flow. 
Explanation:
Plants prepare food on their own and plants also have conductive cells that carry out transportation process. Plants are divided into two types based on their conductive system i.) vascular plants  ii.) non vascular plants.
Vascular plants are those plants which have special conductive cells called phloem and xylem.
Xylem transports water from roots of the plants to other parts of plants and also provides mechanical support to plant. It is uni-directional.
Phloem is the food conducting tissue that transports food to plant and also have bi-directional movement.
 
        
             
        
        
        
Answer:
D. I. 
 maybe its D, I think it might be D 
 
        
             
        
        
        
 Infinity, the concept of something that is unlimited, endless, without bound. ... Spatial and temporal concepts of infinity occur in physics when one asks if there are infinitely many stars or if the universe will last forever.