Blood is red but it lacks RBCs in

Options

A. Frog
B. Rabbit
C. Man
D. Earthworm

Answer

To answer the question "Blood is red but it lacks RBCs in," we need to analyze the options provided and determine which organism's blood is red but does not contain red blood cells (RBCs).

### Step-by-Step Solution:

1. **Understanding Blood Color**: Blood appears red primarily due to the presence of hemoglobin, a protein found in red blood cells that binds to oxygen. In most vertebrates, including humans, red blood cells are responsible for this color.

2. **Analyzing the Options**:
- **Option 1: Frog**: Frogs do have red blood cells, although they are nucleated (contain a nucleus). Therefore, this option is incorrect.
- **Option 2: Rabbit**: Rabbits also possess red blood cells in their blood, making this option incorrect as well.
- **Option 3: Man (Human)**: Humans have red blood cells that are enucleated (do not have a nucleus) but still contain hemoglobin, so this option is also incorrect.
- **Option 4: Earthworm**: Earthworms do not have red blood cells in the traditional sense. Instead, their blood contains a different type of respiratory pigment called erythrochlorin, which gives it a red color. Thus, this option is correct.

3. **Conclusion**: The correct answer to the question is **Option 4: Earthworm**, as it has red blood but lacks traditional red blood cells.

### Final Answer:
Blood is red but it lacks RBCs in **Earthworm**.