The human body has an organ A which acts as a pump. The pump A pumps a liquid B into the whole body continuously. The liquid B supplies the useful substances C and D to all the body cells and removes a waste E from the body cells.
Name the useful substances D.

Answer

To answer the question, we need to identify the organ, the liquid, and the useful substances mentioned in the context of the human body.

### Step-by-Step Solution:

1. **Identify Organ A**:
- The organ that acts as a pump in the human body is the heart. The heart continuously pumps blood throughout the body.

2. **Identify Liquid B**:
- The liquid that is being pumped by the heart is blood. Blood is a vital fluid that circulates through the body.

3. **Identify Useful Substances C and D**:
- Blood carries various substances. The useful substances that blood supplies to body cells include oxygen (C) and nutrients (D).
- Nutrients can include glucose, vitamins, and minerals that are essential for cell function and energy.

4. **Identify Waste E**:
- The waste product that blood helps to remove from body cells is carbon dioxide (E), which is a byproduct of cellular respiration.

### Final Answer:
The useful substances D that are supplied by blood to all body cells include **nutrients** such as glucose, vitamins, and minerals.

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