Question

a student draws a model showing a group of stem cells turning into cardiac muscle cells. stem cells cardiac muscle cells what should be added to the model to show that cell differentiation occurred? showing the size of the cells being the same in each part showing the location of the nucleus in each cell in each part adding markers for which genes are activated or repressed in the stem cells adding another cell where the muscle tissue is instead of the stem cells

Explanation:

Cell differentiation is driven by gene - regulation. Marking which genes are activated or repressed in stem cells can show the process of differentiation into cardiac muscle cells. Size being the same doesn't indicate differentiation. Nucleus location alone isn't conclusive. Adding another cell type doesn't show the differentiation process itself.

Answer:

adding markers for which genes are activated or repressed in the stem cells