The correct response is: An amoeba is responsible for all functions, and a red blood cell is responsible for some functions.
This is because an amoeba is a single-celled organism capable of performing all necessary life functions (such as movement, feeding, and reproduction) on its own. In contrast, a red blood cell is a specialized cell in multicellular organisms (like humans) that has a specific function related to the transport of oxygen and carbon dioxide and does not perform all life functions independently.