Cellular differentiation is the process by which a less specialized cell becomes a more specialized cell type. this process is controlled by
a.) temperature
b.) respiration
c.) gene expression
d.) sensory neurons

The correct answer would be C) gene expression.

Specialized cell refers to a differentiated cell which which performs specific function in the body. For example, RBC helps in transportation of oxygen and carbon dioxide in the body, nerve cell helps in transmission of electrochemical signals throughout the body et cetera.

Undifferentiated cell becomes specialized cell through gene expression.

Each cell in the body contains same genes; however, a particular set of gene is expressed in particular type of cell.

Consequently, different sets of proteins are formed which leads to formation of different types of cells.

the endocrine system secretes hormones into blood and other body fluids. these chemicals are important for metabolism, growth, water and mineral balance, and the response to stress. hormones provide feedback to the brain to affect neural processing. reproductive hormones affect the development of the nervous system.

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