Deuterostome condition and indeterminate radial cleavage are characteristics of

Options

A. Chordates and arthropods
B. Chordates and echinoderms
C. Arthropods and echinoderms
D. Chordates, arthropods, and annelids

Answer

### Step-by-Step Solution

1. **Understanding Deuterostomes**:
- Deuterostomes are a group of animals characterized by their embryonic development. In deuterostomes, the first opening (blastopore) that forms during embryogenesis becomes the anus, while the mouth is formed secondarily.

2. **Identifying Characteristics**:
- Two key characteristics of deuterostomes are:
- **Indeterminate Cleavage**: This means that the fate of the embryonic cells is not predetermined early in development. Each cell has the potential to develop into a complete organism.
- **Radial Cleavage**: This refers to the arrangement of cells during cleavage, where the cells divide in a symmetrical manner around the vertical axis.

3. **Examples of Deuterostomes**:
- The main groups that exhibit these characteristics are:
- **Chordates**: This group includes animals with a notochord, such as mammals, birds, reptiles, amphibians, and fish.
- **Echinoderms**: This group includes marine animals such as starfish, sea urchins, and sea cucumbers.

4. **Distinguishing from Protostomes**:
- In contrast, protostomes (like arthropods and annelids) have a different developmental pattern where the blastopore becomes the mouth, and they exhibit determinate cleavage.

5. **Conclusion**:
- Based on the characteristics of deuterostomes and the examples provided, we conclude that the deuterostome condition and indeterminate radial cleavage are characteristics of **Chordates and Echinoderms**.

### Final Answer
**Deuterostome condition and indeterminate radial cleavage are characteristics of Chordates and Echinoderms.**