How does a single undifferentiated cell lead to a complex multicellular organism?

The answer is the cell becomes specialized in function and form through differentiation.  The process that leads a single undifferentiated egg cell to develop into a complex organism is not fully understood. This process of differentiation is an area of active research. It is known that the key lies in methods of gene expression.              

which are post-impressionist paintings? check all that apply?

explanation:

post-impressionism is a predominantly french art movement that developed roughly between 1886 and 1905, from the last impressionist exhibition to the birth of fauvism. post-impressionism emerged as a reaction against impressionists' concern for the naturalistic depiction of light and color.

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answer; hypnagogic sensations)