Which of the following characteristics does no species of animals possess during some phase of its life cycle ?

Options

A. Mobility
B. Autotrophy
C. Responsiveness
D. Metabolism

Explanation

To solve the question "Which of the following characteristics does no species of animals possess during some phase of its life cycle?", we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Options**:
- We have four options to consider:
1. Mobility
2. Autotrophy
3. Responsiveness
4. Metabolism

2. **Analyzing Mobility**:
- Mobility refers to the ability of an organism to move from one place to another.
- All animals exhibit some form of mobility at some stage in their life cycle (e.g., even sessile organisms like sponges have mobile larvae).
- **Conclusion**: Mobility is not the correct answer.

3. **Analyzing Autotrophy**:
- Autotrophy is the ability to produce one's own food, typically through photosynthesis or chemosynthesis.
- Animals are primarily heterotrophic, meaning they cannot produce their own food and rely on other organisms for nutrition.
- **Conclusion**: Autotrophy is a characteristic that no species of animals possess during any phase of their life cycle.

4. **Analyzing Responsiveness**:
- Responsiveness refers to the ability to respond to stimuli in the environment.
- All animals have the capability to respond to various stimuli, which is essential for survival.
- **Conclusion**: Responsiveness is not the correct answer.

5. **Analyzing Metabolism**:
- Metabolism encompasses all biochemical processes that occur within an organism to maintain life, including energy production and utilization.
- All living organisms, including animals, must have metabolic processes to survive.
- **Conclusion**: Metabolism is not the correct answer.

6. **Final Conclusion**:
- After analyzing all the options, the only characteristic that no species of animals possesses during any phase of their life cycle is **Autotrophy**.

### Final Answer:
**Autotrophy**