MCQ
The excretory structures of flat worms$/$Taenia are:
- ✓Flame cells.
- BProtonephridia.
- CMalpighian tubules.
- DGreen glands.
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| $a.$ | Pineal | $i.$ | Epinephrine |
| $b.$ | Thyroid | $ii.$ | Melatonin |
| $c.$ | Ovary | $iii.$ | Estrogen |
| $d.$ | Adrenal medulla | $iv.$ | Tetraiodothyronine |