MCQ
Apart from the kidneys, the excretory organs are :
- ALungs
- BLiver
- CSkin
- ✓All of these
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The glands which are represented as $X$, $Y$ and $Z$ are
$A$. Pharynx is perforated by gill slits.
$B$. Notochord is absent.
$C$. Central nervous system is dorsal.
$D$. Heart is dorsal if present.
$E$. Post anal tail is absent.
Choose the most appropriate answer from the options given below: