MCQ
Identify $X$ from figure :


- ACavity of uterus
- ✓Placental villi
- CYolk sac
- DUmbillical cord with its vessels

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$(I)$ It is not autoimmune disorder
$(II)$ Affect neuromusculler junction
$(III)$ Occured due to low $Ca^{++}$ in body fluid
$(IV)$ Paralysis of skeletal muscle is symptome of myasthenia gravis
$R$ : Echinoderms have secondarily adapted to radial symmetry.
$I.$ Anabaena
$II.$ Oscillatoria
$III.$ Nostoc
Choose the correct option