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Completed chart:

Type (class)CharacterExample
CyclostomataJawless mouth provided with sucker; skin without scalesPetromyzon (lamprey), Myxine
PiscesGill respirationRohu, shark
AmphibiaAquatic respiration in larva; aquatic and aerial respiration in adult; moist skinFrog, toad
MammaliaMammary glands present; warm bloodedWhale
ReptiliaPoikilotherms (cold blooded); dry scaly skinWall lizard, tortoise, snake

The whale lives in the ocean but is a mammal: it breathes air with lungs, is warm blooded and feeds its young on milk from mammary glands. Fishes and amphibians are also cold blooded, but since Pisces and Amphibia already appear in the chart, the remaining poikilothermic class is Reptilia.

Doubtly AI · 24 Oct 2026 AI-verified · Oct 2026 Report
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