In the Human Body You Can Find a Variety of Cells

In the human body you can find a variety of cells, including skin cells, blood cells, bone cells, nerve cells, and muscle cells.You can find the same variety of cells in a frog.Which statement is true about these cells?

A) As a result of descent from a common ancestor, similar genes are expressed in similar types of cells in frog and human.
B) A common ancestor of frog and human lost similar genetic components that led to cell specialization.
C) Different ancestors of frog and human were exposed to similar environmental pressures that led to cell specialization.
D) Cell specialization was an evolutionary event that occurred after the human and frog lineages split apart from their common ancestor.
E) To express the same types of cells, humans and frogs have identical genetic components.