As the baby grows and develops the cellular level rises. They grow in Length and in width!
Good Luck! :)
        
             
        
        
        
Ok, think about it.  Does your skin prevent germs from getting inside you?
Does your skin prevent water from leaving the body too quickly?  Does your skin protect your insides from getting damaged when you fall?  Do you put food on your skin to absorb nutrients, or do you put food in your mouth like a normal person?
        
             
        
        
        
Answer:
I think it is D
Explanation:
Plants are all of the above (I,II,III) but fungi are heterotrophic, but other than that they have a cell wall in their eukaryotic cells  and are multicellular, so it is most likely D.