Which statement BEST summarizes why these human muscle cell types look different? A) The muscle cells may appear slightly different but the structure and function of each type is identical.
B) The three types of muscle cells look different since they each have different DNA contained in the nucleus.
C) The three types of muscle cells appear different since they are present at different stages of the organism's development.
D) The three types of muscle cells appear different since they are specialized to perform different functions in the human body