Identify the set comprising cold blooded organisms.

The correct answer is Option C: Snake, Frog, Cockroach.

Cold-blooded organisms (also known as ectotherms or poikilotherms) are organisms that cannot regulate their internal body temperature independently. Instead, their body temperature changes with the temperature of their surrounding environment.

Let us analyze the organisms listed in the given options:

1. Snake: Snakes belong to the class Reptilia. All reptiles are cold-blooded (ectothermic).

2. Frog: Frogs belong to the class Amphibia. Amphibians are also cold-blooded organisms.

3. Cockroach: Cockroaches are insects belonging to the phylum Arthropoda. Invertebrates like insects are cold-blooded.

Since all three organisms in this set (Snake, Frog, and Cockroach) are ectothermic, this set comprises entirely cold-blooded animals.

Why the other options are incorrect:

• Lizard, Parrot, Dolphin: Parrots (Birds) and Dolphins (Mammals) are warm-blooded (endothermic).

• Pigeon, Humans, Lizard: Pigeons (Birds) and Humans (Mammals) are warm-blooded (endothermic).

• Whale, Frog, Earthworm: Whales (Mammals) are warm-blooded (endothermic).