हिंदी

Other Characteristic Features

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Estimated time: 2 minutes
CBSE: Class 12

Key Points: Other Characteristic Features

Segmentation Notochord
Some animals show both external and internal division into segments A rod-like structure derived from mesoderm is present during the embryonic stage
This is called metameric segmentation (e.g., earthworm) Present in chordates and absent in non-chordates
Each segment is called a metamere Present in Hemichordates and Chordates; absent from Porifera to Echinodermata
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