Unspecialized cells that are able to renew themselves for long periods of time by cell division

• A. Stem Cells
• B. Clinical Trials
• C. Fume Hood
• D. Water Bath

Answer: (A)

The idea being tested is the ability of certain cells to stay unspecialized and to keep dividing to renew themselves over long periods. These cells are stem cells. Stem cells are unspecialized, meaning they have not yet become a specific cell type, and they can divide to produce more stem cells, preserving a pool of these cells for the organism over time. They also have the potential to differentiate into specialized cell types, which is why they’re so important for growth, development, and tissue repair.

Why this fits best: the definition describes cells that can both self-renew through division and remain available for long periods, which is the hallmark property of stem cells. The other options aren’t cells or don’t describe this capability—clinical trials are studies, a fume hood is safety equipment, and a water bath is lab equipment.