(a) An endothermic animal
Endothermic animal: Birds such as crows, sparrows, pigeons, cranes, etc. and mammals such as bears, cows, rats, rabbits, etc. are endothermic animals.
(b) An ectothermic animal
Ectothermic animals: Fishes such as sharks, amphibians such as frogs, and reptiles such as tortoises, snakes, and lizards are ectothermic animals.
(c) An organism of benthic zone
Organism of benthic zone: Decomposing bacteria is an example of an organism found in the benthic zone of a water body .