Two chambered heart in the development of human being indicate the fundamental

Options

A. Chordate character
B. Vertebrate character
C. Pisces character
D. Amphibian character

Answer

To answer the question regarding the significance of a two-chambered heart in the development of human beings, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Heart**:
- In vertebrates, the heart structure varies across different classes. A two-chambered heart consists of one atrium and one ventricle.

2. **Identify the Classes of Vertebrates**:
- The main classes of vertebrates include Pisces (fishes), Amphibia (amphibians), Reptilia (reptiles), Aves (birds), and Mammalia (mammals).

3. **Recognize the Heart Structure in Different Classes**:
- Fishes (Pisces) have a two-chambered heart (1 atrium, 1 ventricle).
- Amphibians have a three-chambered heart (2 atria, 1 ventricle).
- Most reptiles also have a three-chambered heart, with the exception of crocodiles, which have a four-chambered heart.
- Birds and mammals possess a four-chambered heart.

4. **Relate the Two-Chambered Heart to Human Development**:
- During embryonic development, humans and other mammals exhibit certain primitive features that reflect their evolutionary history. The presence of a two-chambered heart indicates a shared ancestry with fishes.

5. **Choose the Correct Answer**:
- Since the two-chambered heart is characteristic of fishes (Pisces), the correct answer to the question is option C: Pisces character.

### Final Answer:
The two-chambered heart in the development of human beings indicates the fundamental **Pisces character** (Option C).

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