MCQ
Brains acts as the ...$A$... and ...$B$... system.
Here, $A$ and $B$ refer to
- ✓Command; control
- BVoluntary; involuntary
- CCompound; voluntary
- DControl; involuntary
Here, $A$ and $B$ refer to
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| Organisms | Characteristics |
| ($a$) Platyhelminthes | ($i$) Cylindrical body with no segmentation |
| ($b$) Echinoderms | ($ii$) Warm blooded animals with direct development |
| ($c$) Hemichordates | ($iii$) Bilateral symmetry with incomplete digestive system |
| ($d$) Aves | ($iv$) Radial symmetry with indirect development |