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What is the basis of classification of P...

What is the basis of classification of Protochordata?

A

Gut

B

Brain

C

Gills

D

Notochord

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### Step-by-Step Solution 1. **Definition of Protochordata**: Protochordata, also known as Hemichordata, is a group of animals that serve as an evolutionary link between invertebrates and vertebrates. 2. **Characteristics of Protochordata**: - They possess both invertebrate and vertebrate characteristics. - They lack a true nerve cord, which is a characteristic of invertebrates. - They have a notochord, which is a characteristic of vertebrates. 3. **Body Organization**: The body of Protochordata is divided into three main parts: - **Proboscis**: The anterior part of the body. - **Collar**: The middle part of the body. - **Trunk**: The posterior part of the body. 4. **Classification Basis**: The classification of Protochordata is based on several key features: - **Gut Development**: The gut system is generally undeveloped. - **Brain Development**: The brain is poorly developed or may even be absent. - **Gills**: Gills are absent in Protochordata. - **Notochord**: The presence of a notochord, which is typically found only in the upper part of the body, is a significant characteristic for classification. 5. **Conclusion**: The presence of the notochord is a defining feature that classifies Protochordata and distinguishes it from other groups. This characteristic supports the idea that Protochordata forms a transitional link between invertebrates and vertebrates.
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