Cell differentiation always involves
a. transcription of the myod gene.
b. the movement of cells.
c. the production of tissue-specific proteins.
d. the selective loss of certain genes from the genome.

(C) The production of tissue-specific proteins.

Explanation:

 The cell differentiation is the process in which the cell change from one cell place to another place. It basically occur due to the process of gene expression.

The cell differentiation involve the production of the specific tissue protein known as muscle actin. In cell differentiation, the pluripotent stem cell basically go in the specific differentiation level and then reach in the state of fully differentiation.

The fully differentiation produced a specific function that the production of the protein. Therefore, option (C) is correct.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds