MCQ
Petromyzon belongs to
- ✓Agnatha
- BGnathostomata
- CProtochordata
- DEuchordata
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$(a)$ Nitrogenous waste build-up in the body
$(b)$ Non-elimination of excess potasslum ions
$(c)$ Reduced absorption of calcium ions from gastrointestinal tract
$(d)$ Reduced $RBC$ production
Which of the following options is the most appropiate?
$I.$ Maxillae $II.$ Malleus
$III.$ Incus $IV.$ Stapes
$V.$ Vomer