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Classify the following based on number of chambers in their heart.

Rohu, Scoliodon, Frog, Salamander, Flying lizard, King Cobra, Crocodile, Ostrich, Pigeon, Bat, Whale
 
a. Rohul, Scoliodon -
 
b. Frog, Salamander, Flying lizard, King Cobra -
 
c. Crocodile, Ostrich, Bat, Whale -
Answer variants:
3 chambered
2 chambered
4 chambered