The cause of cell differentiation is that different cells _________.

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Differentiation occurs numerous times during the development of a multicellular organism as it changes from a simple zygote (one cell) to a complex system of tissues and cell types.
Embryonic cells become specialized cells as cells differentiate during a process called gene expression. Gene expression describes the specific combination of genes that are expressed (or repressed) and this is what instructs each cell how to function.
The main difference between plant and animal cells is that plant cells have a cell wall on the outer layer, whereas animal cells only have a cell membrane. The formation of a cell wall is a result of differentiation, not a cause.
In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the sex chromosomes, differ between males and females. This is not related to cell function and differentiation.
Mitochondria vary in number and location according to cell type. A single mitochondrion is often found in unicellular organisms. However, this number may be different in specialized cells, such as liver cells, which have about 1000-2000 mitochondria per cell. It is important to note than mitochondria number is defined by the type of cell and it is a result of cell differentiation, not the reason for it.

The Cause of Cell Differentiation Is That Different Cells _________