Anus develops first in the embryo and mouth
is formed later. It is called

Options

A. deuterostomatic
B. protostomatic
C. both (1) and (2)
D. none of these

Answer

To answer the question, "Anus develops first in the embryo and mouth is formed later. It is called," we need to follow a systematic approach to understand the classification of organisms based on embryonic development.

### Step-by-Step Solution:

1. **Understanding Embryonic Development**: In embryology, the development of the mouth and anus is crucial in classifying organisms. The first opening that develops in the embryo is significant in determining the type of organism.

2. **Identifying the Types**: There are two main classifications based on the development of the mouth and anus:
- **Protostomes**: In protostomic organisms, the mouth develops first from the blastopore, and the anus develops later.
- **Deuterostomes**: In deuterostomic organisms, the anus develops first from the blastopore, and the mouth develops later.

3. **Focusing on the Question**: The question specifies that the anus develops first, which directly points to the classification of deuterostomes.

4. **Examples of Deuterostomes**: Common examples of deuterostomic organisms include:
- Echinoderms (like starfish)
- Chordates (like mammals, birds, and fish)

5. **Conclusion**: Since the question states that the anus develops first and the mouth develops later, the correct term for this classification is **deuterostomes**.

### Final Answer:
The answer is **deuterostomes**.

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