Explanation:
Serotonin is an inhibitory neurotransmitter that  responsible for regulating the bodies mood and behavior in the central nervous system and affect the functions of the entire body. Prozac and Zoloft are antidepressants that help retain more serotonin neurotransmitters in neurons.
Answer:
d) serotonin
 
        
                    
             
        
        
        
Cells of the skin and digestive tract are continuously sloughed off and replaced by new ones due to mitotic division.
Some body parts of animals and plants can be regenerated by mitotic cell division. 
Vegetative propagation in plants and budding in some animals also occurs due to mitosis.
        
             
        
        
        
Explanation:
Scientists didnt belive that there are cells untill robert hooke (1665). He observed the cells in a cork slice with the help of a PRIMITIVE microscope
Leeuwenhoek (1674), with the help of an improved microscope, discovered free living cells in pound water for the first time. 
It was robert brown in (1831) who discovered the nucleus in the cell. 
Purkinjie in 1839 coined the term 'protoplasm' for the fluid substance of the cell. 
THE CELL THEORY, that all plants and animals are composed of cells and that the cell is the basic unit of life, was presented by two biologists, schleiden (1838) and schwann(1839). The cell theory was fuether expanded by virchow (1855) by suggesting that all cells aris form PRE-EXISTING cells. With the discovery of the electron microscope in 1940,it was possible to observe and understand the complex structure of the cell and its various organelles. 
Well, thats the history of the discovery of cells. 
 
        
             
        
        
        
I think none of the men are the father, they don’t match the child’s results.