Find out the incorrect statement.

Options

A. Archaebacteria flourish in hot springs and deep sea hydrothermal vents where the temperature exceeds `100^@C`
B. Many fish thrive in Antarctic waters where the temperature is always below zero.
C. A large variety of marine invertebrates and fish live at great depths in the ocean where the pressure could be 100 times the normal atmospheric pressure.
D. Desert lizard have physiological ability that mammals have to deal with the high temperature of their habitat.

Answer

To solve the question "Find out the incorrect statement," we will analyze each of the provided statements one by one to determine their accuracy.

### Step-by-Step Solution:

1. **Analyze Option A**:
- **Statement**: "Archaeobacteria flourish in hot springs and deep-sea hydrothermal vents where the temperature exceeds 100 degrees Celsius."
- **Evaluation**: Archaeobacteria, also known as archaea, are known for their ability to thrive in extreme conditions, including high temperatures. They can survive in environments like hot springs and hydrothermal vents, where temperatures can exceed 100 degrees Celsius.
- **Conclusion**: This statement is **correct**.

2. **Analyze Option B**:
- **Statement**: "Many fish thrive in Antarctic waters where the temperature is always below zero."
- **Evaluation**: Certain fish species, such as icefish and cod, possess antifreeze proteins that allow them to survive in sub-zero temperatures. Therefore, it is accurate that many fish can thrive in these cold Antarctic waters.
- **Conclusion**: This statement is **correct**.

3. **Analyze Option C**:
- **Statement**: "A large variety of marine invertebrates and fish live at great depth in the ocean where pressure could be 100 times the normal atmospheric pressure."
- **Evaluation**: It is well-documented that many marine organisms, including various fish and invertebrates, inhabit deep ocean environments where the pressure is significantly higher than at the surface. These organisms have adaptations that allow them to survive in such extreme conditions.
- **Conclusion**: This statement is **correct**.

4. **Analyze Option D**:
- **Statement**: "Desert lizards have physiological ability that mammals have to deal with the high temperature of their habitat."
- **Evaluation**: This statement is misleading. While desert lizards have adaptations to survive in high temperatures, they do not possess the same physiological mechanisms as mammals, such as sweating. Instead, they rely on behavioral adaptations, such as burrowing into the sand to escape the heat. Therefore, the comparison to mammals is incorrect.
- **Conclusion**: This statement is **incorrect**.

### Final Answer:
The incorrect statement is **Option D**.

---