Organisms with two different types of symmetries in two differnet stages of life are

Options

A. sponges
B. annelids
C. molluscs
D. echinoderms

Answer

To answer the question about organisms with two different types of symmetries in two different stages of life, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Symmetry**:
- Symmetry in biology refers to the balanced distribution of duplicate body parts or shapes. The two main types of symmetry are:
- **Bilateral Symmetry**: Organisms can be divided into two identical halves along one plane (e.g., humans, insects).
- **Radial Symmetry**: Organisms can be divided into similar halves around a central axis (e.g., jellyfish, starfish).

2. **Identify Organisms with Different Symmetries**:
- We need to find organisms that exhibit two different types of symmetry at different life stages.

3. **Examine the Options**:
- **Sponges**: They do not exhibit any symmetry (asymmetrical).
- **Annelids**: They exhibit bilateral symmetry throughout their life.
- **Molluscs**: They also exhibit bilateral symmetry throughout their life.
- **Echinoderms**: They have a complex life cycle where they start as bilateral larvae and then develop into adults with pentaradial symmetry.

4. **Conclusion**:
- The only organisms that fit the criteria of having two different types of symmetry in different life stages are **Echinoderms**. They begin life as bilateral larvae and later develop into adults with pentaradial symmetry.

### Final Answer:
- The organisms with two different types of symmetries in two different stages of life are **Echinoderms**.

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