Discussion
Identify the set comprising cold blooded organisms.
Answer: C
The set of cold-blooded organisms is Snake, Frog, Cockroach.
Cold-blooded (poikilothermic) animals cannot keep their body temperature constant; it changes with the surroundings. Reptiles such as snakes, amphibians such as frogs and invertebrates such as cockroaches are all of this kind.
Each other set contains a warm-blooded animal: birds (parrot, pigeon) and mammals (dolphin, humans, whale) maintain a constant body temperature. The lizard and earthworm in those sets are cold-blooded, but one warm-blooded member is enough to rule a set out.
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