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| स्तंभ $I$ (जंतु) | स्तंभ $II$ (श्वसन अंग) |
|---|---|
| $i$. स्पंज (Sponges) | $a$. बाह्य गलफड़े (External gills) |
| $ii$. कीट (Insects) | $b$. प्लाज्मा झिल्ली (Plasma membrane) |
| $iii$. लिमुलस (Limulus) | $c$. श्वास नली (Tracheae) |
| $iv$. उभयचर टैडपोल (Amphibian tadpoles) | $d$. बुक गिल्स (Book gills) |
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