Question

adult stem cells are undifferentiated cells that have been found in many different tissues and organs. adult stem cells are very versatile. the primary role of an adult stem cell is to repair and maintain tissue.
the morula starts as a solid ball of totipotent cells that are formed from a single cell after we begin becoming human.
cells divide through the process of differentiation.
cells become specialized through the process of differentiation.
cells become specialized through the process of mitosis.
cells divide through the process of mitosis.

Explanation:

To solve this, we analyze each option:

• Option 1: Distribution is not the process of cell division. Cell division is mitosis/meiosis, so this is incorrect.
• Option 2: Differentiation is the process by which cells become specialized (e.g., muscle cells, nerve cells from a single - celled zygote). The morula is a ball of undifferentiated cells, and as development proceeds, cells differentiate. This matches the concept.
• Option 3: Mitosis is cell division (producing identical cells), not specialization. So this is incorrect.
• Option 4: Mitosis is cell division, not related to the idea of cells becoming specialized from the morula's undifferentiated cells. So this is incorrect.

Answer:

B. Cells become specialized through the process of differentiation.